From the Black Label panel coverage:
Doyle then moved to praising Romita's work on Superman: Year One, which reunites him with Frank Miller.
Frank Miller "actually sounded excited," said Romita. "He sounded like a little kid."
Miller told Romita to draw "whatever he wanted" based on a minimal plot, after which Miller, Romita, and the editorial team will all agree on the story, and Miller scripts over the finished artwork.
The early part of the story shows how Superman deals with normal human problems through the lens of his super powers.
Superman Year One #2 shows Clark Kent living in Atlantis. Miller wanted to show Clark "fall in love with entire Earth."
That's how Clark comes to join the Navy in this story and is recruited to the Navy SEALS - before leaving the Navy when he realizes what he has to do to be part of the military.
Romita researched Navy SEALS extensively.
"Frank would have allowed me to draw forever," Romita said.
Romita focused on a more widescreen approach to his storytelling, trying to channel the feeling of a film.
Romita's favorite image in the entire 190 page story is "Wonder Woman stopping Superman from breaking Batman's neck with a punch."
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