
The M1A1. safe destroying incendiary is designed for the sole purpose of destroying cryptographic equipment CSP 2900, SIGROD, or ASAMI-1, stored in the Signal Corps CH-76 two section safe. It is authorized for issue only outside the zone of interior. It cannot be used to destroy papers or other materials in field safes, since it does not supply oxygen.
Incendiary, Safe Destroying, TH1, M1A2
TM 3-300, Ground Chemical Munitions (1956)