M2 Browning

The M2 Machine Gun, Browning .50 Caliber Machine Gun, is a heavy machine gun designed towards the end of Worldwar by John Browning. It is very similar in design to Browning's earlier M1919 Browning machine gun, which was chambered for the .30-06 cartridge. The M2 uses the much larger and much more powerful .50 BMG cartridge, which was developed alongside and takes its name from the gun itself (BMG standing for Browning Machine Gun).

M2 Browning in Worldwar
The .50 caliber M2's were issued to the US Army and the US Cavarly during their war with the Race. It's .50 caliber slugs were more than capable of punching through the body armour the Race's infantry wore.