USAF Thunderbirds fly the Diamond formation. Historically, as Thunderbirds 1 through 4 lift off, the slot aircraft slips immediately into position behind 1 to create the signature Diamond formation. Thanks to the 2009 upgrade to the Block 52, the Diamond now has more than enough thrust to continue to climb straight up into their first maneuver, the Diamond Loop. -wiki
Photo by Bob Nelson on Sunday August 30, 1992, at the GFAFB.