The TOW missile system has been in service since 1970 with more than 650,000 missiles produced. Current production versions include: TOW 2A (BGM-71E), which entered production in 1987 with over 118,000 missiles delivered. TOW 2B (BGM-71F) entered production in 1991 with more than 40,000 missiles delivered and is designed to complement rather than replace TOW 2A, TOW 2B Aero, and TOW 2A bunker buster (BGM-71H). A production contract for the new extended-range TOW 2B Aero was awarded by the US Army in February 2004. The contract was for 976 missiles, delivered by December 2006. A US Army contract for more than 2,700 TOW 2B and TOW 2B Aero missiles (including practice rounds) was placed in July 2004. TOW 2B Aero with ITAS has been selected for the US Marine Corps' next-generation AAWS-H (anti-armour weapon system-heavy) programme.