ORANGUTAN = unlocks Mission 2 of 6 (A Storm in the Port)
CHIMP = Unlocks mission 4 of 6
BABOON = unlocks Mission 3 of 6 (Neddle in a Haystack)
LEMUR = unlocks Mission 5 of 6 (Rolling Thunder)
GORILLA = unlocks Mission 6 of 6 (The Horten's Nest)

Note: Type the names into the enigma machine to make the codes work.