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        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 3, PART X</FormAndLineReferenceDesc>
        <ExplanationTxt>SPACE ISAC QUALIFIES AS A TAX-EXEMPT ORGANIZATION UNDER SECTION 501(C)(6) OF THE INTERNAL REVENUE CODE AND, ACCORDINGLY, IS NOT SUBJECT TO FEDERAL INCOME TAX EXCEPT ON NET INCOME UNRELATED TO ITS EXEMPT PURPOSE. ACCORDINGLY, NO INCOME TAX PROVISION HAS BEEN RECORDED. SPACE ISAC'S FORM 990, RETURN OF ORGANIZATION EXEMPT FROM INCOME TAX, IS SUBJECT TO EXAMINATION BY VARIOUS TAXING AUTHORITIES, GENERALLY FOR THREE YEARS AFTER THE DATE FILED. MANAGEMENT OF SPACE ISAC BELIEVES THAT IT DOES NOT HAVE ANY UNCERTAIN TAX POSITIONS THAT ARE MATERIAL TO THE FINANCIAL STATEMENTS.</ExplanationTxt>
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        <ExplanationTxt>SPACE ISAC SERVES TO FACILITATE COLLABORATION ACROSS THE GLOBAL SPACE INDUSTRY TO ENHANCE OUR ABILITY TO PREPARE FOR AND RESPOND TO VULNERABILITIES, INCIDENTS, AND THREATS; TO DISSEMINATE TIMELY AND ACTIONABLE INFORMATION AMONG MEMBER ENTITIES; AND TO SERVE AS THE PRIMARY COMMUNICATION CHANNEL FOR THE SECTOR WITH RESPECT TO THIS INFORMATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>DELEGATION OF CONTROL OF MANAGEMENT DUTIES: SPACE INFORMATION SHARING AND ANALYSIS CENTER (SISAC) ENGAGED NATIONAL CYBER SECURITY (NCS) TO PROVIDE EXECUTIVE DIRECTOR SERVICES (ERIN MILLER). OFFICER COMPENSATION REPORTED IN FORM 990, PART VII AND PART IX, REFLECT THE PAYROLL AMOUNTS PAID BY NCC ON BEHALF OF SISAC. ALTHOUGH NCC PROVIDES EXECUTIVE DIRECTOR SERVICES THROUGH AN EXISTING ARRANGEMENT, THE EXECUTIVE DIRECTOR MANAGES SISAC AT THE DIRECTION AND OVERSIGHT OF THE SISAC BOARD OF DIRECTORS SOLELY. BEGINNING IN 2024, SPACE ISAC DIRECTLY EMPLOYS THE EXECUTIVE DIRECTOR AND OTHER STAFF FOR THE PURPOSE OF EXECUTING ITS MISSION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBER OF THE CORPORATION SHALL CONSIST OF ENTITIES, INCLUDING SPACE SYSTEMS MANUFACTURERS, SUPPLIERS, COMMERCIAL SPACE COMPANIES, AND R&amp;D ENTITIES, IN EACH CASE, THAT ARE PRIVATELY OR PUBLICLY OWNED OR NON-PROFIT CORPORATIONS, IN GOOD STANDING.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOUNDING MEMBER ENTITIES APPOINT THE BOARD OF DIRECTORS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS ELECT THE BOARD MEMBERS AS WELL AS APPROVE SIGNIFICANT DECISIONS OF THE GOVERNING BODY. ANY ACTION REQUIRED OR PERMITTED BY THE BYLAWS AND THE NONPROFIT ACT TO BE TAKEN AT A MEMBER'S MEETING MAY BE TAKEN WITHOUT A MEETING IF MEMBERS ENTITLED TO VOTE THERON UNANIMOUSLY AGREE AND CONSENT TO SUCH ACTION IN WRITING.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>UPON COMPLETION AND PRIOR TO SUBMISSION, FORM 990 WILL BE SENT TO THE TREASURER AND THE BOARD CHAIR FOR REVIEW AND FINAL APPROVAL.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>SPACE ISAC CONFLICT OF INTEREST: EACH DIRECTOR, OFFICER, AND MEMBER OF A COMMITTEE WITH BOARD DELEGATED POWERS ANNUALLY SIGNS A STATEMENT WHICH AFFIRMS THAT EACH PERSON: 1) HAS RECEIVED A COPY OF THE CONFLICTS OF INTEREST POLICY; 2) HAS READ AND UNDERSTANDS THE POLICY; 3) HAS AGREED TO COMPLY WITH THE POLICY; 4) UNDERSTANDS THE ORGANIZATION IS TAX-EXEMPT AND IN ORDER TO MAINTAIN ITS FEDERAL TAX EXEMPTION, IT MUST ENGAGE PRIMARILY IN ACTIVITIES THAT ACCOMPLISH ONE OR MORE OF ITS TAX-EXEMPT PURPOSES. IF A CONFLICT OF INTEREST ARISES, THE INTERESTED PERSON SHALL RECUSE HIMSELF OR HERSELF FROM ENGAGING IN ANY RELATED SPACE ISAC ACTIVITY ASSOCIATED WITH THE PROPOSED TRANSACTION OR ARRANGEMENT UNTIL THE BOARD OR OTHER APPLICABLE COMMITTEE HAS ACTED ON THE ACTUAL OR POSSIBLE CONFLICT OF INTEREST.</ExplanationTxt>
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        <ExplanationTxt>COMPENSATION IS DETERMINED AFTER APPROVING AN ANNUAL BUDGET BY THE SPACE ISAC BOARD OF DIRECTORS. THE NATIONAL CYBERSECURITY CENTER, A RELATED ORGANIZATION, IS THE OPERATIONAL ENTITY AND DETERMINE THE C.E.O, EXECUTIVE DIRECTOR, TOP MANAGEMENT, KEY EMPLOYEES AND OFFICER WAGES AND THE ALLOCATION OF FUNDS FOR YEARS PRIOR TO 2024.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION IS DETERMINED AFTER APPROVING AN ANNUAL BUDGET BY THE SPACE ISAC BOARD OF DIRECTORS. THE NATIONAL CYBERSECURITY CENTER, A RELATED ORGANIZATION, IS THE OPERATIONAL ENTITY AND DETERMINES THE C.E.O, EXECUTIVE DIRECTOR, TOP MANAGEMENT, KEY EMPLOYEES AND OFFICER WAGES AND THE ALLOCATION OF FUNDS.</ExplanationTxt>
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