sentences:  The 484th's planes and other B-52Ds had been modified under a program called Big Belly, which increased the bombload of wing aircraft to 84 500lb bombs or 42 750lb bombs, from the 27 it could previously carry.From this point, the Big Belly B-52D became the SAC workhorse in Southeast Asia.By 1967, Intercontinental ballistic missiles had been deployed and become operational as part of the United States' strategic triad, and the need for B-52s had been reduced.