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        <UnrelatedBusinessRevenueAmt>1670</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>3081</ExclusionAmt>
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      <OtherSalariesAndWagesGrp>
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        <ProgramServicesAmt>76222</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5715</ManagementAndGeneralAmt>
        <FundraisingAmt>4555</FundraisingAmt>
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        <ProgramServicesAmt>7172</ProgramServicesAmt>
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      <AdvertisingGrp>
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        <ProgramServicesAmt>1900</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <OfficeExpensesGrp>
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        <ProgramServicesAmt>341</ProgramServicesAmt>
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        <FundraisingAmt>204</FundraisingAmt>
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        <ProgramServicesAmt>81013</ProgramServicesAmt>
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        <FundraisingAmt>4</FundraisingAmt>
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      <InterestGrp>
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        <ProgramServicesAmt>39</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </InterestGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>12555</TotalAmt>
        <ProgramServicesAmt>12515</ProgramServicesAmt>
        <ManagementAndGeneralAmt>30</ManagementAndGeneralAmt>
        <FundraisingAmt>10</FundraisingAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
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        <ProgramServicesAmt>6578</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2193</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Credit card processing fees</Desc>
        <TotalAmt>3632</TotalAmt>
        <ProgramServicesAmt>3632</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Bank service charges</Desc>
        <TotalAmt>45</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>45</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Other museum-related costs</Desc>
        <TotalAmt>8338</TotalAmt>
        <ProgramServicesAmt>8338</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Exhibit development/maintenance</Desc>
        <TotalAmt>25624</TotalAmt>
        <ProgramServicesAmt>25624</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>7873</TotalAmt>
        <ProgramServicesAmt>5694</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1546</ManagementAndGeneralAmt>
        <FundraisingAmt>633</FundraisingAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>245795</TotalAmt>
        <ProgramServicesAmt>229068</ProgramServicesAmt>
        <ManagementAndGeneralAmt>10893</ManagementAndGeneralAmt>
        <FundraisingAmt>5834</FundraisingAmt>
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      <CashNonInterestBearingGrp>
        <BOYAmt>193334</BOYAmt>
        <EOYAmt>198349</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
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        <EOYAmt>340170</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>5107</EOYAmt>
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      <InventoriesForSaleOrUseGrp>
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        <EOYAmt>73482</EOYAmt>
      </InventoriesForSaleOrUseGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>1490</BOYAmt>
        <EOYAmt>4054</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>58140</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>56808</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>2471</BOYAmt>
        <EOYAmt>1332</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <TotalAssetsGrp>
        <BOYAmt>598336</BOYAmt>
        <EOYAmt>622494</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>133589</BOYAmt>
        <EOYAmt>30635</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <DeferredRevenueGrp>
        <BOYAmt>150</BOYAmt>
        <EOYAmt>3028</EOYAmt>
      </DeferredRevenueGrp>
      <UnsecuredNotesLoansPayableGrp>
        <BOYAmt>1416</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </UnsecuredNotesLoansPayableGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>180</BOYAmt>
        <EOYAmt>449</EOYAmt>
      </OtherLiabilitiesGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>135335</BOYAmt>
        <EOYAmt>34112</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>429716</BOYAmt>
        <EOYAmt>524867</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>33285</BOYAmt>
        <EOYAmt>63515</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>463001</BOYAmt>
        <EOYAmt>588382</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>598336</BOYAmt>
        <EOYAmt>622494</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>125381</ReconcilationRevenueExpnssAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>false</FSAuditedInd>
      <AuditCommitteeInd>false</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
    </IRS990>
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      <OtherSupportSumAmt>0</OtherSupportSumAmt>
      <GiftsGrantsContriRcvd170Grp>
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        <CurrentTaxYearMinus3YearsAmt>206844</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>165095</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>135573</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>182485</CurrentTaxYearAmt>
        <TotalAmt>898668</TotalAmt>
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      <TaxRevLeviedOrgnztnlBnft170Grp>
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      <GovtFurnSrvcFcltsVl170Grp>
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      </GovtFurnSrvcFcltsVl170Grp>
      <TotalCalendarYear170Grp>
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        <CurrentTaxYearMinus3YearsAmt>206844</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>165095</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>135573</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>182485</CurrentTaxYearAmt>
        <TotalAmt>898668</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>0</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>898668</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
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        <CurrentTaxYearMinus3YearsAmt>21811</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>20197</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>6516</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>16280</CurrentTaxYearAmt>
        <TotalAmt>91636</TotalAmt>
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      <UnrelatedBusinessNetIncm170Grp>
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        <CurrentTaxYearMinus3YearsAmt>4087</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>194</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1561</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1934</CurrentTaxYearAmt>
        <TotalAmt>7776</TotalAmt>
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      <OtherIncome170Grp>
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      <PublicSupportCY170Pct>0.88860</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.89070</PublicSupportPY170Pct>
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      <PublicSupportTotal509Amt>0</PublicSupportTotal509Amt>
      <PublicSupportCY509Pct>0</PublicSupportCY509Pct>
      <InvestmentIncomeCYPct>0</InvestmentIncomeCYPct>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Pt II Ln 10</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Income Part II, Line 10 Description: Fundraising events 2017: 1768. 2018: 1959. 2019: 3087. 2020: 3497. 2021: 2981.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="IRS990ScheduleB-01">
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        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
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        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="IRS990ScheduleD-01" softwareId="21013422">
      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
      <LandGrp>
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        <BookValueAmt>0</BookValueAmt>
      </LandGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>35338</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>34058</DepreciationAmt>
        <BookValueAmt>1280</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>22802</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>22750</DepreciationAmt>
        <BookValueAmt>52</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>1332</TotalBookValueLandBuildingsAmt>
      <FederalIncomeTaxLiabilityAmt>259</FederalIncomeTaxLiabilityAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Maryland income tax liability</Desc>
        <Amt>190</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>449</TotalLiabilityAmt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt III, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>Description of organization's collection of artwork and</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt III, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>how it furthers the organization's exempt purpose: Collection consists of original paintings, prints &amp; photographs of naval aircraft. The subjects include: naval aircraft; test &amp; evaluation events; life at Patuxent River NAS; military memorabilia; and, other related military aircraft. These items memoralize the history of research, development, test &amp; evaluation activities including joint service missions, all of which have relevance to the Pax River Naval Air Station and its many activities over the years.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="IRS990ScheduleO-01" softwareId="21013422">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Did the organization have members or stockholders? The organization accepts membership dues from individuals, businesses and other parties. In return, these members receive a quarterly newsletter, invitations to special events, free museum admission, and a member's discount as they purchase items from the museum's gift shop.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 8b</FormAndLineReferenceDesc>
        <ExplanationTxt>Did the organization contemporaneously document meetings/written actions undertaken during the year by any committee with authority to act on the governing board's behalf? None of the organization's committees have the authority to act on the governing board's behalf.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Describe the process by which the organization's governing body will review this Form 990: Due to the urgent nature of filing this return, the Treasurer performed a review of the complete Form 990/Form990-T prior to its submission to the Internal Revenue Service. He will then present it to the entire Board of Directors at its next meeting. The organization will then file an amended return if the Board's review indicates the need to do so.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Describe the manner in which the Board of Directors monitored and enforced compliance with its written conflict of interest policy: The Board of Directors vets prospective Board members as to compliance with the requirements of its written conflict of interest policy, and this policy is then discussed with new directors during their orientation session(s). Annually (at the beginning of the organization's fiscal year), all Board members file a conflict of interest disclosure. They are then expected to notify the Board in the event that they encounter a situation requiring action under the policy during the following year.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Describe the availability of the organization's governing documents, conflict of interest policy, and financial statements for members of the public: These documents are currently available upon written request. The organization's Form 990's for prior years are also available within the the website maintained by GuideStar (www.guidestar.org).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>Did the organization make any significant changes to its governing documents since the prior Form 990 was filed: The organization adopted an update of its by-laws in March 2023. A PDF copy of the updated by-laws is attached to this Form 990.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
