http://www.youtube.com/watch?v=mqIJL8lx00oYes, SAC had its 6 engine strategic bomber fly a low level attack profile designed for tactical fighters that culminated in a full loop half roll (i.e., first half of a Cuban Eight) aerodynamically demanding maneuver. This was the Cold War, era of the nuclear depth charge and mortar...compared to those, this was small potatoes. The maneuver itself involved a 2.5 g pull up (the aircraft had a structural limit of 3 g's; anything beyond that risked catastrophic structural failure) followed by flying the aircraft vertically on thrust alone around 85 knots, buffeting right on the edge of a stall. While it was never conclusively proven to a direct result of flying LABS missions, the B-47 fleet suffered serious wing fatigue issues while it was flying the low level LABS missions (probably a combination of the low level flight and the sharp pull ups); 6 aircraft had their wings simply shear off while on low level LABS training missions.
http://www.airspacemag.com/military-avi ... ichel.html
