I would argue that the sympathy is irrelevant
The abortion debate is such a personal one and its based on such deep seated morals and beliefs that I don't think either side will have much success convincing the other on the emotional aspects. For me the only important part is debating it from the legallity perspective in which case whether someone has sympathy, pity or anger towards the lady doesn't matter, so long as they can have one. Granted I'm only one dude though and I appreciate my view is far from the only one, but that's my personal response.
But I think the same argument applies to sympathy. If you hear a woman ended up pregnant and she didn't want it you just think that she had sex with some dude and that's what happened. Or if you're a douche you assume she's a bike but whatever. Soldiers are a really emotive thing though. Especially in the US there's such a hero culture around them that smypathy is nearly inevitable and then it presumably comes from this idea that they got wounded, but they did it doing a really tough job for the sake of freedom and protecting you and all that jazz.
You're far more appreciative of soldiers and there's a general feeling that what they do is quite selfless. They sacrifrice themselves and put themselves in harms way so we might live how we do, or they do it to look after their friends. That's a very different way to end up with an ailment (I couldn't think of a word for both pregnancy and a wound, sorry) than the very self centered act of just having sex.
Plus there's a feeling that with all the birth control and stuff available thee days that its actually very hard to fall pregnant and can only happen through incompetence in some way. Comparitively a soldier is a much larger victim of chance, especially when you're looking at things like Afghanistan where a lot of the injuries come from IED's or mines. In which case if there's any blame apportioned its normally at the government or the army, not the individual.
I have no idea if I'm actually answering your point or not. I'm completely shattered so sorry if I'm not.