Morality and ethics are determined by group standards, what the group requires or prohibits is what causes an action to be acceptable or not. Since different groups have different criteria, then there is no principle or other fundamental rule which applies, ergo, ethical/moral behavior is flexible and subjective as well. Even within a group, at different hierarchical levels different criteria often apply: You treat members of your family different than you do your friends, neighbors, colleagues, countrymen, and other species.

Human beings are social animals, and for groups to function without excess conflict some mutually acceptable codes of behavior must be adopted and enforced. This is done unconsciously, through culture. This is why we dislike thieves, and why we teach our kids to dislike thieves, not because we can logically prove that theft is wrong. The proof is in those societies that accept theft (or murder, or slavery, or rape, or torture) as fine as long as it is practiced on some group other than one's own. What you call "objective reality" is nothing but the superstitions of your tribe.

Your examples illustrate this clearly, the military is not concerned with morality, it's job consists of killing people, and telling other people to put themselves in a position to be killed. It is not concerned with anything but maintaining discipline and keeping human behavior controlled and predictable in extreme circumstances. All military organizations emphasize honor and tradition, not just ours. Don't get misty-eyed over this emotion, it is cynically designed to do one thing, keep people malleable under fire. It works great with 18 year olds and with middle aged men who have known no other life.

A rigid behavior code enforces group solidarity and cohesion and channels emotion to that end. Honor and tradition and the rest of that ceremonial dressing is deliberately designed to emphasize this, morality has nothing to do with it. The Romans invented it all 2500 years ago because they learned it helped win battles. The military substitutes ceremony and ritual for sentiment and emotion, and if you had been in the military you would know that.

As for religious traditions being the source of morality, this is rubbish, since different religions consider different forms of behavior moral or immoral. This obviously contradicts your statement that there is some objective standard of morality that is amenable to reason and logic. If there were an objective standard, we and the Mullahs would agree on all moral points.

You have mistaken culture for morality, probably because you are only familiar with one culture and find it very difficult to comprehend how anyone else's behavior could be different from yours unless it were fundamentally flawed in some way.