Brian Frost was born in 1982 to a middle-class family from Duxford. He enlisted to British Army in 2000 and worked his way up to Pegasus Company, the Parachute Regiment's training ground in Catterick. After passing the selection and the training, he was assigned to 2nd Batallion of the Parachute Regiment.

Flawless performance and good record from the batallion's operations in Iraq earned him promotion and opportunity for additional training. Soon before leaving to Takistan in 2012, Sgt. Frost resumed command of a Paratrooper team.

Sgt. Frost is not related with Major General John Dutton Frost, the legendary WW2 commander of 2nd Battalion, the Parachute Regiment. However, he lives to the best of his namesake's heritage.