The Special Operations Forces (SOF) Combat Assault Rifle, or SCAR, is a modular rifle made by FN Herstal (FNH) for the United States Special Operations Command(SOCOM) to satisfy the requirements of the SCAR competition. This family of rifles consist of two main types. The SCAR-L, for light, is chambered in the 5.56×45mm NATO cartridge and the SCAR-H, for heavy, fires 7.62×51mm NATO. Both are available in Long Barrel and Close Quarters Combat variants.
The FN SCAR systems completed low rate initial production testing in June 2007. After some delays, the first rifles began being issued to operational units in April 2009, and a battalion of the US 75th Ranger Regiment was the first large unit deployed into combat with 600 of the rifles in 2009. The US Special Operations Command has currently cancelled their purchase of the Mk 16 SCAR-L and are planning to remove the rifle from their inventory by 2013. However, they plan to purchase 5.56 mm conversion kits for the Mk 17, supplanting the loss of the Mk 16.  The Mk 16 is now one of the competing weapons in the Individual Carbine competition which aims to find a replacement for the M4 Carbine.