32°48′18.900″N 44°27′36.068″E / 32.80525000°N 44.46001889°E / 32.80525000; 44.46001889
Forward Operating Base Kalsu, also known as 'FOB Kalsu', COS Kalsu or simply Camp Kalsu, was a U.S. Military installation in Northern Babil Province , Iraq, 20 miles south of Baghdad. It was officially closed by members of the 1st Brigade Combat Team, 1st Cavalry Division, on December 12, 2011 as part of the US Army's withdrawal from Iraq.