Boot Camp is the first full level featuring the Marine Corps Recruit Depot in San Diego California in September of 1941 where Thomas Conlin and his future squad mates go through the basic layout of the game, including controls, weapons, and commands.It revolves around a United States Marine, Thomas Conlin, and his squad as they progress through the many major conflicts of the Pacific Theater against Japanese Army, from Pearl Harbor to Tarawa Atoll. Medal of Honor: Pacific Assault is the second game in the Medal of Honor series to focus upon the Pacific Theater rather than that of Europe, along with Rising Sun. There is also heavy emphasis on squad combat, with the playable character being able to give basic orders (advance, retreat, regroup, and open fire) to his squad mates, Frank Minoso, Jimmy Sullivan, and Willy Gaines and other, unnamed squad members. It was the first game to introduce Ironsights, allowing for precision aiming on weapons other than sniper rifles.
Unlike previous Medal of Honor games, Pacific Assault places more emphasis on front-line combat and story.