SideWinder 5
All basic missions
Press Down, R2, R1, Up(2), L1, L2, L1, Start at the title screen.
All fighters
Press L2(2), Right, R1(3), Left(2), R2(4), Start at the title screen.
All Tamiya illustrations
Press Left, Right, L2, L1, Left, Right, Down, Up, Start at the title screen.
EX mission 3
Successfully complete the game, then get an "S" rank in mission 6-2.
EX mission 4
Successfully complete the game, then get an "S" rank in mission 9-1.