AERIAL SECURITY As seen through a night-vision device, U.S. Marine Corps Gunnery Sgt. Marcus S. McCollum provides aerial security over Helmand province, Afghanistan, Dec. 17, 2013. McCollum, a crew chief assigned to Marine Heavy Helicopter Squadron 462, provided aerial support for British forces with Task Force Helmand during an operation. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 811444-Z-IOQ74-719.jpg Photo Gallery