Well, Frank Castle was once a normal family man and a veteran. He served in the military, which gave him all kinds of combat skills. But then, his family got caught in the crossfire of a mob - related shooting in Central Park. Losing his wife, kids, everything in one fell swoop. This shattered his world and led him to take the law into his own hands as the Punisher. He uses his military know - how to hunt down and punish those he deems guilty in the criminal underworld.
Sure, Frank Castle has ended up in prison in the comics. It usually happens as part of the complex storylines and his battles against the criminal underworld.
In Frank Castle's origin story, his military past is crucial. It equipped him with the physical and mental capabilities to wage his war on crime. But the most significant element is the tragic loss of his family. His family was the center of his world. When they were brutally killed by the mob in Central Park, it was like his whole world collapsed. This led to his transformation into the Punisher. He no longer believed in the slow - moving justice system and instead took it upon himself to punish those who wronged him and society at large. His origin story is a blend of his military - trained self and the broken man seeking revenge for his family's death.
The War Machine is often associated with Iron Man in the Marvel universe. It was designed as a more militarized version of the Iron Man suit. Rhodey, Tony Stark's friend, pilots the War Machine. It has powerful weaponry and advanced armor capabilities, being used in various battles against villains. It represents a more combat - focused approach compared to Iron Man's suits which sometimes have more of a focus on innovation and quick adaptation.
In some fanfictions, Naruto could potentially be depicted as a 'war machine'. Fanfiction often takes creative liberties with characters. Some authors might explore a darker or more militaristic side of Naruto, where his powers are used in a very aggressive, war - like manner. However, this is a departure from his more typical characterizations in the original series.