Cheat Mode:
While playing a game, hold F10 and enter one of the following codes. Then, hold F10 and press F5 to activate the appropriate cheat as many times as needed. To enter another code, hold F10 and press F6 to disable the current code. Then, hold F10 and enter the next code.

Result                   Cheat             
Restore shield           F2, F1, F4, F3.
Blue player turns black  F2, F1, F4, F3, F3, F4, F1, F2.
Reload weapon 0          F2 F4 F1 F3, F1, F3, F4, F2.
Reload weapon 1          F4, F3, F1, F2, F4, F3, F1, F2.
Reload weapon 2          F2, F1, F2, F4, F2, F1, F3.

Crime War Mode Single Player Level Passwords:

Zone    Name              Password
2       Zuma Beach        TAFRGYBLRR
3       La Brea Tar Pits  CRGRGYBLRY
4       Venice Beach      FUMRGYBLRL
5       Hell's Gate Prison SICUGYBLLI
6       Studio City       TAFUGYBLLR
7       LAX Spaceport     CRGUGYBLLY
8       Long Beach        FUMUGYBLLL
End     Long Beach Completed  SIFYGYBISR

Precinct Assault Mode Single Player Level Passwords:
Level  Password
Urban Jungle-
5      FUCUGYBIMI
10     SUHUGYBIDR
 
Proving Grounds- 
5      SICRRYBLLI
10     TIFRNYBLSR
 
Hollywood Keys- 
5      SICRGYDLLI
10     TIFRGYPLSR
 
Venice Beach-
5      SICRGLBLLI
10     MIFRGIBLSR
      

Thanks to Revolution reader The dupiness!