A weapons company, sometimes called a manoeuvre support company, is a company-sized military unit attached to an infantry battalion to support the rifle companies of the battalion. It usually possesses some combination of machine-guns, mortars, anti-tank missiles, anti-aircraft missiles, reconnaissance vehicles and, sometimes, assault pioneers (infantrymen specially trained in the assault role).
In the British army, the manoeuvre support company possesses an Anti-Tank platoon armed with Javelin, a reconnaissance platoon, a mortar platoon (with eight 81 mm mortars), an assault pioneer platoon, and, in the case of Light Role battalions, a machine gun platoon (with nine GPMGs).
In the United States Marine Corps, the infantry battalion weapons company is tasked with providing supporting fire for the three rifle companies that (along with the battalion's headquarters and service company make up the remaining balance of the battalion. The weapons company provides organic fire support coordination, mortar, anti-armor, and heavy machine gun support.
The company is often organized into four distinct elements: company headquarters, mortar platoon (utilizing the M252 81mm mortar), anti-armor platoon (utilizing the FGM-148 Javelin and BGM-71 TOW missile systems), and a heavy machine gun platoon (equipped with the M2 .50 caliber machinegun, and MK-19 40mm automatic grenade launcher.