'By the late 1950s, the skies above Washington were becoming perilously crowded. Bolling Air Force Base and Washington National Airport, with their parallel runways just across the river from each other, were competing for air space. As a result, flight activities of all fixed-wing aircraft were transferred to nearby Andrews AFB, Maryland. Forty-four years after the dedication of Bolling Field, the last airplane departed July 1, 1962, carrying 33 passengers and six crew members bound for Andrews.'
http://www.globalsecurity.org/military/facility/
bolling.htm
If a runway hasn't been rebuilt since that time, then it simply can't handle the size and weight of today's jets and cargo planes.