Although Dellums opposed the B-2 project from the start, Congress approved initial funding for production of 135 bombers in 1987. However, with the winding down of the Cold War, total B-2 production was reduced to 21 aircraft in the early 1990s. But in 1997, seven former Secretaries of Defense signed a letter urging Congress to buy more B-2s, citing the difficulty of assembling a similar engineering team in the future should the B-2 project be terminated. Dellums, citing five independent studies consistent with his position, offered an amendment to that year's defense authorization bill to cap production of the bombers with the existing 21 aircraft. The amendment was narrowly defeated; nonetheless, Congress never approved funding for additional B-2 bombers.