In the early hours of January 12, 1981, a Machetero commando infiltrated Muñiz Air National Guard Base at San Juan's international airport and blew up eleven jet aircraft — destroying eight A-7 Corsair fighters and a Phantom outright — causing some $45 million in damage in a few minutes, without casualties. It was among the costliest attacks ever carried out on a U.S. military installation in peacetime.
The raid, announced as a protest against the use of Puerto Rico as a U.S. military platform and against the Vieques bombing range, humiliated base security and made the tiny organization internationally known. It also concentrated federal attention: the FBI's San Juan field office and a Connecticut grand jury began building the conspiracy architecture that would produce the mass arrests of 1985.