Most people join the military because of feelings of patriotism for their country. It’s generally not for the money or benefits, though they sometimes rationalize it to themselves that way. If you look at the hours spent and the risk to your personal safety, the pay and benefits any servicemember gets doesn’t usually work out to be a great deal.
Indeed, the heart of the oath that military personnel take is “to support and defend the Constitution of the United States of America.” Even those who join for less altruistic reasons are still serving their country.
Your biggest misconception, I think, is that military wants to fight wars. Most military personnel have no desire to go to war. However, whether they want to fight in a war or not, nobody in the military gets to make the decision as to whether the country should go to war or not.
You also appear to believe that we should not have any career military personnel. You seem to think that we can call up volunteers and conscripts for any future conflict. This makes as little sense as would getting rid of all police forces, and believing that you can call up volunteers should a crime ever occur. Modern industrialized armed forces need far more highly trained personnel than untrained volunteers and conscripts. It takes millions of dollars and years of training to produce effective fighter pilots, nuclear submarine officers, and missile technicians. In addition, you need experienced leadership, from the NCOs and petty officers to the generals and admirals.
You might ask why we need all of that. The short answer is that one of the fundamental duties of a government is to be able to protect its citizens and its sovereign territory. Any nation that fails to do this survives only because it is under a stronger nation’s protection, or survives at the pleasure of nations with viable militaries. When the U.S. was a new, weak nation 200 years ago, other nations (France and the U.K., at various times) seized our ships and citizens at their whim. Nobody does that anymore to us without consequences.
Also, realize that a career military person joins for 20-30 years, over the course of numerous presidential administrations. You can’t have a viable career in the military if you were to get out every time you disagreed with the current administration.
Most career military personnel have reconciled their personal political beliefs with the feeling that their overall service to the nation outweighs any disagreement they might have with current policies.
Let me turn the question around for you. Assuming that you are a U.S. citizen, your taxes pay for our military and for its operations in Iraq. Do you think it is honorable for you to pay these taxes? Don’t tell me that you have no choice–you certainly do. You can refuse to pay (and go to jail), or you can emigrate and move to a country whose policies you agree with.
Finally, as a former military servicemember, let me say the most people in the military do in fact respect their adversaries. Former WWII adversaries (Americans and Japanese) have had joint memorial ceremonies. I have met a German U-Boat sailor who fought against us in WWII, and I treated him with respect. I met Soviet officers and sailors during the height of the Cold War and treated them with respect. I might have been ordered to fight those same men a week later, and I would have done it. I am thankful that this never happened.
So long as military personnel serve their country honorably, meaning that they follow the lawful orders they are given (which includes compliance with the Geneva Conventions), there is indeed something to admire in their actions, and they are doing something noble by serving their country.