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Castellum, Inc.
1934 Old Gallows Road, Suite 350
Vienna, VA 22182
April 16, 2024
United States Securities and Exchange Commission
Division of Corporation Finance
Office of Trade & Services
100 F Street, N.E.
Washington, D.C. 20549
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| Re: | Castellum, Inc. |
| Registration Statement on Form S-3 (File No. 333-278553) |
Ladies and Gentlemen:
In accordance with Rule 461 of the Securities Act of 1933, as amended, Castellum, Inc. hereby respectfully requests that the effective date of the above-captioned Registration Statement be accelerated so that it will be declared effective at 5:00 p.m. Eastern Time on Thursday, April 18, 2024 or as soon thereafter as possible.
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| Very Truly Yours, |
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| CASTELLUM, INC. |
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| /s/ Mark C. Fuller |
| Mark C. Fuller |
| Chief Executive Officer (Principal Executive Officer) |