Army Men: Air Combat Codes -

Level select:
Enter R, C-Left, Right, Up as a password to unlock all levels and helicopters in single player mode.

Level	Password
2	Up, Down, Left, Right
3	Up, Down, Left, Up
4	Down, Up, Left, Right
5	Down, Up, Left, Down
6	Down, Up, Right, Down
7	Left, Down, L, Up
8	Left, Down, L, Down
9	Left, Up, L, Down
10	L, Up, Left, Down
11	L, Up, Left, Up
12	L, Up, L, Down
13	L, Down, Up, Left
14	R, C-Left, Up, Right
15	C-Down, L, Down, Down
16	R, C-Left, Right, Up