On Fri, Oct 12, 2001 at 11:38:23AM -0500, Paul E. Robichaux wrote:

The GBU-28 is basically a 155mm artillery barrel packed full of explosives. Well, OK, not really, but that's what the first set of GBU-28s used in Gulf War I were. Slap some guidance fins and a standard LGB kit on it, and voila!

Actually, the tubes were from decommissioned M110A2 8-inch howitzers (203mm) cut down to 19 feet in length (just in case anyone's estimating yield at home, the 8-inch tube gives about 70% more volume than 155mm -- about a cubic yard).