On January 12, 1981, the Ejército Popular Boricua (Boricua Popular Army

Boricua Popular Army

The Boricua Popular/People's Army — or Ejército Popular Boricua in Spanish — is a clandestine organization based on the island of Puerto Rico, with cells in the United States. They campaign for and support the independence of Puerto Rico from what they characterize as United States colonial rule...

), a Puerto Rican terrorist organization, carried out multiple bombings at the Luis Muñoz Marín International Airport. At the time, it was the largest attack on U.S. military forces since the Vietnam War.
The bombings took place at the Air National Guard facilities. Initial reports were that eight fighter jets were destroyed but later it was discovered that all 10 LTV A-7 Corsair II and a Lockheed F-104 Starfighter had been destroyed or damaged beyond repair.

The bombings resulted in increases in base security. It was revealed that there were to be 22 personnel, up from 11, guarding the base, funded entirely by the federal government as well as electric devices added to the fence.