Obviously, a scene in which prostitutes are brought to the Dozen before they go on the mission is simply skipped over.
A comparison between the movie and the comic book can actually form an interesting discussion about what is appropriate for a child to watch or read and what isn't. I personally think that a level of violence in children's stories is perfectly fine--violence can be a legitimate part of drama in stories for all ages. But that in turn can lead to discussions involving how much violence can be desensitizing or otherwise make violence appear fun or harmless. These are both legitimate concerns that are often readily dismissed today without sufficient consideration. If you're interested, I do talk about this a little more in my ebook 99 films Your Children Must See Before Growing Up; or They'll Turn Out to Be Axe Murderers. In the end, of course, parents are best qualified to each make these decisions for their own kids. Parents simply need to be aware that they should be giving thought to the issue. (The Dirty Dozen, by the way, is NOT included as an essential film in my 99 Films ebook. Your kid can skip it and he won't turn out to be an ax murderer. Oh, and yes, I do realize this was a pretty shameless plug for one of my books.)
In terms of storytelling, a fan of the movie can be a little annoyed that so many cool bits have been
left out and condensing the story does leave it feeling a little choppy. The comic book picks up with the Dozen already in their training camp, with the officious Colonel Breed (Robert Ryan's role in the film) working to get the project shut down. The Dozen are still shown cheating in a war game maneuver to prove they can be an effective commando unit, then its off to the real mission. The need to condense means the action isn't anywhere near as well-choreographed as in the movie, but the writer and Jack Sparling do a fine job in the space they have.
It's probably the lack of time to show characterizations that hurt the comic book the most. We never really get to know any of the Dozen (other than realizing Maggot is just plain nuts), so the deaths of guys like Jefferson, Pinkley and Franco don't come with the same emotional impact.
There's also a few things that remind us the comic book guys were using the script rather than the final film to create the adaptation. In the movie, one of the Dozen dies off screen in a parachute accident at the start of the mission. This is because the actor was having differences with the filmmakers, who just tossed up their hands when it was time to film the battle and said "Let's just kill him off." In the comic book, this character sticks around for the actual fighting.
Also, there's a scene in which Sgt. Bowren (the M.P. in charge of the guards at the training camp) is found on the plane flying them to France--he stowed away to come on the mission himself. This is a scene edited out of the final film (or not filmed at all--I actually have no idea), so that Bowren is simply there on the mission without explanation. So I suppose in this one point, the comic book improves a little on the story.