Bill Grey is a childhood schoolmate of Fox, Falco and Slippy's, ace pilot and a commander of the Husky and Bulldog squadrons in the Cornerian Army that serve to defend Katina against the Androssian fleets and the Anglar Armies. Since ace star pilots of the Cornerian Air Force are few and far between, Bill and his units are very valued in high esteem by his military superiors.