Marine Attack Squadron 131 (VMA-131) was an A-4 Skyhawk attack squadron in the United States Marine Corps. The squadron, also known as the “Diamondbacks”, were part of the Marine Forces Reserve and were based at Naval Air Station New York, Brooklyn, New York from 1960 through 1972 and NASJRB Willow Grove from 1972 until their deactivation in 1998.