Alien Grenade Upgrade
In the Life or Death stage, there is a small key on a dead soldier in the damage elevator where Cole starts the level. Take the key and open all the lockers in the level. One of the small lockers in the first power-conduit pit has a databank item that upgrades the alien grenade.
(Thanks to gingerben66@hotmail.com)

Secret Tapes
Find and scan all five databank items in a level to unlock the secret of that level. The final secret of the game is unlocked when all prior secrets have been found.
(Thanks to gingerben66@hotmail.com)

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