Name your company one of the following:
"DO IT AGAIN" --------------- repeat a failed mission
"ROB A BANK" ----------- start with 1,000,000 credits
"WATCH THE CLOCK" ------------ time goes really quick
"NUK THEM" --------------- select any country/mission
"TO THE TOP" - all weapons, equipment, mods available
"COOPER TEAM" - start with all cash, weapons, mods, missions,
equipment
A weapon dropped by other syndicate agents will contain very little ammo but one dropped by the police or a guard will be fully loaded.
Persuade as many enemy agents as possible to get loads of cash, and then equip your team with version 3 modifications.
In the very tough missions persuade some innocent people because they can act as a shield and they also pick up any weapons they find and fire them at whatever you fire at.
It is wise to save the game after each successfully completed mission, this may be time consuming but it saves you having to back track if you fail.