Mercenaries 2: World in Flames - Unlimited health

Unlimited ammunition:
At the PDA factions screen, press Right, Left, Right, Right, Left, Right, Left, Left.

Full fuel:
At the PDA factions screen, press Right, Down, Left, Up, Right, Down, Left, Up.

1 million:
At the PDA factions screen, press Right, Down, Left, Up, Up, Left, Down, Right.

All factions neutral:
At the PDA factions screen, press Up, Up, Up, Up, Down, Down, Right, Left.