 Complete the following phrase:  On 12 January 1981, the Boricua Popular Army, also known as the Macheteros, a group of home grown Puerto Rican terrorists advocating separation from the United States and establishment of Puerto Rico as an independent nation, infiltrated Muñiz Air National Guard Base. Armed with pipe bombs, they destroyed or damaged eleven PRANG aircraft: ten A-7D Corsair IIs and a single F-104 Starfighter being retained for eventual static display as a memorial. The terrorist attack was the largest on any U.S. Air Force installation since the Vietnam War, although the ongoing 