Task: Question Understanding
Input (English): Context : Armored vehicles designed specifically to counter the land mine threat were first used during the Rhodesian Bush War; the technology subsequently matured with the development of the South African-designed Casspir armored fighting vehicle, which inspired the United States MRAP program and was the basis for some of the program's vehicles. 
Question : What was the year MRAP entered service?
Output (English): service entry