Successfully complete the game, then play practice mission 1 with Austin's Zaku 1. Successfully complete it and you should have a heavy Fed shield like the Gundam's, and a few new supplies.
Game Shark Codes
Master Code (Must Be On) 0E3C7DF2 1853E59EEE8D117A BCCAB6C2
Unlock All Pilots DEADBF86 BDAA9C84DEADBF82 BDAA9C84DEADBF8E BDAA9C84DEADBF8A BDAA9C84DEADBF96 BDAA9C84
Unlock All Simulations [Note] DEABC3AA BFAC9E86DEABC3B6 BFAC9E86DEABC3B2 BFAC9E86DEABC3BE BFAC9E86DEABC3BA BFAC9E86DEABC346 BFAC9E86DEABC342 BFAC9E86DEABC34E BFAC9E86DEABC34A BFAC9E86DEABC356 BFAC9E86
All Missions Rank S [Note] DEABC242 BDAA9C84DEABC24E BDAA9C84DEABC24A BDAA9C84DEABC256 BDAA9C84
All Simulations Rank S [Note] DEABC086 BDAA9C84DEABC082 BDAA9C84DEABC08E BDAA9C84DEABC08A BDAA9C84DEABC096 BDAA9C84DEABC092 BDAA9C84DEABC09E BDAA9C84DEABC09A BDAA9C84DEABC0A6 BDAA9C84DEABC0A2 BDAA9C84
Note: You may have to start a new game for these codes to work.