Bigfoot is a United States Marine.
Through unknown circumstances, the soldier known by the call-sign Bigfoot joined the United States Marine Corps, where he eventually earned his call-sign.
For some time, Bigfoot was in William "Buccaneer/the Buck" Broyles Recon Marine squad, known as Marine Reconnaissance Unit 1.
When Broyles' squad was broken up, Bigfoot and Pancho were transfered to Schofield's unit. Unlike Pancho, Bigfoot did not take the change as badly, believing Schofield to be a good leader.