sandbox
n.— «They call it the “sandbox.” Southwest Asia is a dangerous place.…More than 150 U.S. troops died in the war with Iraq.…Every soldier, sailor, airman and Marine who has worked and fought in the “sandbox” has a story to tell.» —“Arkansas answer 9/11 call” by Amy Schlesing Arkansas Democrat-Gazette June 20, 2003. (source: Double-Tongued Dictionary)