From what I’ve seen; the TUSK kit was was fielded in combat ops (in Iraq) in 2006, by 2008, all Abrams in-country were fitted with the kits. Noted that not EVERY piece of the kit was used. as pictured below, the belly armor and lower ERA blocks on the side skirts was used, along with the armored cupolas on the commander and gunner stations. Some units added the coaxial .50 cal MG over the mantlet.
