A5-HELIUM MILSPEC MIL-PRF-27407E.PDF

Published: 08/18/2026

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AMSC N/A FSC 9135 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Comments, suggestions, or questions on this document should be addressed to AFPET/PTPS, 2430 C Street, Building 70, Ar...

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