- "Jackson! Find that ZPU and take it out so we can get some air support! Lopez! Gaines! Cover him!"
- — Vasquez telling Gaines, along with Lopez to cover Jackson while destroying the ZPU.
- For the former Infinity Ward lead artist Gaines is named after, see Robert Gaines.
Gaines is a United States Marine that Vasquez orders to cover Jackson while searching for the Anti-Aircraft gun in "The Bog". However, he is never actually seen in "The Bog" supporting War Pig as his role is filled by a randomly generated Marine.