PREVENTIVE MAINTENANCE Army Pfc. Jared Smith conducts a preventive maintenance check on a humvee during at the National Training Center on Fort Irwin, Calif., Oct. 4, 2008. Smith is a forward observer assigned to the 1st Cavalry Division's Headquarters and Headquarters Troop, 1st Squadron, 7th Cavalry Regiment. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 051910-M-LZU04-145.jpg Photo Gallery