Petty Officer 1st Class Jessica Norton zeros her M-4 rifle. U.S. Navy Petty Officer 1st Class Jessica Norton, with Explosive Ordnance Disposal Mobile Unit One Company 1/3, zeros her M-4 rifle at the range at Contingency Operating Base Speicher, Iraq, on Nov. 27, 2008. SHARE IMAGE: Download Image: Full Size (0.03 MB) Photo By: VIRIN: 423579-A-HAO20-147.jpg Photo Gallery