Medal of Honor: Frontline Cheats

Turn on subtitles in the options menu to
translate the German's

Successfully complete the game with a gold medal in every mission to receive the EA LA Medal of Valor. Successfully complete the following missions with all gold medals to receive the corresponding medal:

If you go to the cheat menu in options and you tyep in supershot all your guns will act like a sniper Rifle...

To enable this code, enter SUPERSHOT at the Bonus screen

Enter these codes at the Enigma Machine.

Code - Result:
EAGLE - Unlock Mission 2, A Storm in the Port
HAWK - Unlock Mission 3, Needle in a Haystack
PARROT - Unlock Mission 4, Several Bridges Too Far
DOVE - Unlock Mission 5, Rolling Thunder
TOUCAN - Unlock Mission 6, The Horten's Nest
SEAGULL - Get a Gold Medal on the current mission
SILVERSHOT - Silver bullet, One hit kills enemies
BOUNCE - Rubber grenades
HIDENSEEK - Invisible Enemies
SUPERSHOT - Snipe-O-Rama, all weapons are sniper mode
HEADSUP - Achilles' head, Enemies only dies of headshot

Type in ''EAGLE'' in the password section of the options screen.
Source: GameFAQS Message Board