Levelcodess:

ECKS MISSIONS
level 2: smokey
level 3: butterfly
level 4: covey
level 5: tiger
level 6: hornet
level 7: litterbug
level 8: mustang
level 9: spectre
level 10: nimrod
level 11: spooky

SEVER MISSIONS
level 2: raven
level 3: firefly
level 4: bulldog
level 5: dragon
level 6: loudmouth
level 7: stinger
level 8: nail
level 9: zorro
level 10: xray
level 11: reddog