History
Frank Castle worked for S.H.I.E.L.D. and given some of the Super-Soldier Serum by "President Rogers". He was sent out to kill super-heroes. During their attack on Spider-Man, Frank did not like Clinton Barton murdering Parker's aunt and Uncle as well.
Much later he was sent out to capture Namor, but Namor escaped and fled to the Arctic. Here he was able to defeat Castle, so Castle was given a suit of armor developed by Tony Stark, donning the identity of Iron Man. He used it to capture Namor, who had just found the real Captain America. After Captain America thawed, Frank turned on his fellow S.H.I.E.L.D. and joined Cap's new Avengers.
After recruiting several other members they then traveled to the S.H.I.E.L.D. Helicarrier to cut off the supply of Super-Soldier Serum. They rescued Thor and after Captain America defeated "President Rogers", Iron Man and the rest of the Avengers gave their lives in freeing America from the tyranny S.H.I.E.L.D. and the president had put it under.[1]Paraphernalia
Equipment
Iron Punisher Armor (similar to the Mark 3 armor)
Weapons
Arm-mounted machine guns, uni-beam, repulsors
Transportation
Quinjets, armor induced flight