FORCE:

Although he first appeared in SUB-MARINER #68, Force, a.k.a. Clay Wilson, made his IRON MAN debut in #140, a hired-gun of one Justin Hammer. Ruthless and strong in his Hammer-financed, micro-circuited battlesuit, he was a force to be reckoned with. But his career of murder and piracy ended in a friendship with Tony Stark.
When we first met Force he was committing piracy on the high seas, stealing ships and yachts for Hammer's drug smuggling operations. Later we learned he was just another kid who got seduced by the dark side of power.
As a teaching assistant at a nice university, Clay Wilson discovered how to control force-fields. Young and impressionable, he wanted power. Justin Hammer was able to suck him into the criminal underworld with promises of lots and lots of power.
Hammer bankrolled his uniform and weaponry--all for the standard fifty percent fee on all his ill-gotten profits--and Force did his bidding, an arrangement Clay was fine with for quite awhile.
Force's chief power is that he can control energy fields--including the polarization fields of Iron Man's armor. Surrounding himself in a protective force-field he can fly or operate underwater, moving at super-human speed. His suit has an early Heads-Up Display that allows for mapping projection, and so on.
Force returned in #223, tired of living a life of crime and being Hammer's lackey, he ran away, turning to Tony Stark for help. But since he was a considerable source of income, Hammer didn't want to let him go. Hammer activated the Safelok circuit, a device meant to prevent his men from leaving. When activated, it not only blocked communications, but also turned their costumes into deadly traps. In Force's case, if the prodigal agent attempted to remove his armor, the circuit would release the power of his weapons internally, electrocuting him. Needless to say, the inventive mind of Tony Stark was the only thing that could free Clay Wilson. And Tony did help him, but only after exacting the promise that Force would turn his armor over to him. Besides the armor, Wilson gave Stark info on Hammer's operations. (Stark would soon learn that the incredible armor and fearsome power of Force came from his own designs, starting the armor wars.)
Stark provided Wilson a new life after Justin Hammer sent Beetle, Blacklash, and Blizzard to kill him. He became, Carl Walker, a tech at Barstow Electronics.
Walker would go on to be a trusted confidant of Mr. Stark. Even donning the Iron Man armor when needed, including a turn in the Iron Legion. 
Force returned in IRON MAN, VOL. III, issue #81. Believing Tony had ratted him out to clandestine government operation, he once again tried to kill Stark. In truth, while Walker was heading up a design team for a new military contract at Barstow, a rouge Pentagon official found out about his mercenary past and blackmailed him into working on Tony's pirated designs at Edgewood Arsenal--including copies of Tony's armors. He was intent on burying Stark in the Iraqi desert, until Tony convinced him that he hadn't betrayed him. Force then helped him defeat Vitriol.
Weapons: Force-fields used offensively and defensively; suit capable of producing EM-pulses.

(Excerpt used by permission of the Iron Man Armory)