The Lancer is a long-range, multi-role heavy bomber that dropped Joint Air-to-Surface Standoff Missiles.
The US has not divulged where the Lancers took off, but they may have left from Al Udeid Air Base in Qatar The Drive reported.
Either way the US released a picture of one of the B-1s being refueled by a KC-10 on the day of the strike.
Here's what the Lancer can do, and what we know it did on Friday:
