It makes no sense from a writing standpoint. Soldier Boy doesn't know that he killed those people, and his pride at serving his country does show that he cared about the nation. Especially considering the fact that he allowed himself to be experimented upon so that he can become a supersoldier for the cause. He could've died from the V injection for all he knew, and he still took that risk and kept fighting for his country for 40 years. And he's somehow portrayed negatively because he thinks differently of women in combat? Sure, Mallory was pissed at the guy for treating her more like a floozie rather than a soldier, but to be fair to the man, he was an adult during the 1940s, and attitudes were different back then. Not to mention that he fought alongside Crimson Countess, so it's not like he didn't want female fighters on the field. He just had a different attitude due to the fact that he grew up half a century ago compared to most of them.
Stormfront and Soldier Boy were adults when they were given Compound V, weren't they? Soldier Boy was already a grown man, and Stormfront was Frederick Voight's wife.