sentences:  This was the first peacetime incident in which USAF aircraft were destroyed by a domestic act, and the first time separatists had attacked a USAF installation on US soil.It was the greatest material loss from any single attack perpetrated against the USAF anywhere in the world.The National Guard Bureau (NGB) was aware of the shortfalls in security at Muñiz ANG Base, and of the threat, yet corrective actions had not been implemented at the time.