Marines from the 2nd Combat Engineer Battalion explode a line charge. U.S. Marines from the 2nd Combat Engineer Battalion explode a line charge in a simulated breach of a mine field at the Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., on Feb. 27, 1998. The Marines are taking part in Combined Arms Exercise 4-98. SHARE IMAGE: Download Image: Full Size (0.04 MB) Photo By: VIRIN: 254975-T-ALT05-535.jpg Photo Gallery