INFANTRY IMMERSION Dr. Jill Biden, wife of Vice President Joe Biden, wraps up her trip to the Infantry Immersion Trainer on Marine Corps Base Camp Pendleton, Calif., Jan. 20, 2012. Biden is escorted by Marine Corps Lt. Gen. Thomas D. Waldhauser, commander of 1st Marine Expeditionary Force and U.S. Marine Corps Forces Central Command. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 396267-O-LWI56-652.jpg Photo Gallery