Rivero was promoted to admiral for choosing Bikini, then oversaw Diego Garcia.

Evidence

For his work in selecting Bikini for the nuclear tests, the Navy rewarded Horacio Rivero by making him an admiral—the first Latino admiral in Navy history. His next promotion made him the director of the Navy’s long-range planning office, where he would discover Stuart Barber’s “brilliant idea” for Diego Garcia. — David Vine, Base Nation_ How U.S. Military Bases…, 195