Abortion and war are two separate issues and it is possible to oppose abortion while supporting a war and vice versa. Abortion is always wrong because it is always wrong to deliberately take an innocent human life. An unborn child is an innocent, defenseless human being, and nothing can justify killing such an innocent.
However, wars can either be just or unjust; and it is perfectly moral to support a just war. Many of those who are killed in wars are not innocent. You may be of the opinion that the war in Iraq is unjust and that, therefore, you must oppose it, but someone who believes that it is just may in good conscience support it and still be considered pro-life.
There are circumstances when giving birth will take the life of the mother and may also produce a dead baby. Granted those cases are rare but they happen. If that possibility exists, who has the responsibility and right to make the decision? Is it you, or the state, or anyone not directly involved with that decision and not subject to the direct consequences of that decision? I don't believe so.
Do we have the right and responsibility to try to influence those who would choose an abortion which is not absolutely necessary? Of course. ...wars can either be just or unjust; and it is perfectly moral to support a just war.
Who and what determines a "just war"? That is usually the winner. North Vietnam won their war against South Vietnam and the U.S. so from their perspective it was a just war. That war produced a larger and stronger communist country. Was that a moral outcome? Many of the soldiers who fought and died in Vietnam were drafted; it was not their choice to go thousands of miles from their home and engage in war - could they not be called innocent also? However you look at that, there were thousands of innocent civilians killed. Of course war and abortion are different but there are similarities and it is very important who chooses either of those activities and why.