Question: When was the group attacked in the attack on the Four Square Laundry formed?
Related documents: [0]  [DOC] The Military Reaction Force, Military Reconnaissance Force or Mobile Reconnaissance Force (MRF) was a covert intelligence-gathering and counter-insurgency unit of the British Army active in Northern Ireland during the Troubles, a former member described it as a "legalised death squad". The unit was formed during the summer of 1971 and operated until late 1972 or early 1973. MRF teams operated in plain-clothes and civilian vehicles, equipped with pistols and submachine guns. They were tasked with tracking down and arresting, or killing, members of the Irish Republican Army (IRA). The MRF also ran double agents within the paramilitary groups and ran a number of front companies to gather intelligence. In October 1972, the Provisional IRA uncovered and attacked two of the MRF's front companies—a mobile laundry service and a massage parlour—which contributed to the unit's dissolution. [END] 
[1]  [DOC] The Attack on the Four Square Laundry was a Provisional IRA ambush in the Twinbrook area of Belfast against a special British Military unit known as the Military Reaction Force. At least one undercover British soldier (Edward Stuart (20)) was killed, the IRA claimed they killed 5 undercover soldiers altogether. The attack took place on 2 October 1972. [END] 
Answer: 
summer of 1971
summer of 1971