Enter codes at the main menu:

• All Ranks and Medals: BLACK, L, R, L, B, R, Y, L, WHITE
• All Ships: BLACK, L, X, L, X, R, R, B, WHITE
• God Mode: BLACK, L, B, L, R, Y, Y, B, WHITE
• All Missions: BLACK, R, L, B, X, L, R, Y, WHITE
• Kobayashi Maru Difficulty: BLACK, L, Y, L, L, X, Y, R, WHITE

When you shoot the antenna array (blue sphere) on top of the space station they will no longer send in reinforcements. This is in level 3 renegade.