This is definately a topic that could be disscussed in length so heres my bit,
i would never wear any medals that i was not entiled to wear,nor would i wear either wear a maroon or green beret as these have to be earnt the hard way,if wearing one of my uniforms i will wear it correctly to the best of my ability,if it has badges of rank i will not act as if i am that rank if asked i will explain what it means and answer any questions thereafter,i feel the correct uniform complements the whole vehicle display.As for the reenacting thing if the group is portraying a certain time or unit then i feel it is acceptable to wear the rank or ribbons that will go to make the experiance more realistic,but i think that there are too many cowboys that just want to play and not understand what this impression gives.As to distastful things this is part of war and unfortunatly is a part of history so saying that you cant reenact certain units is defeating the object because they existed and therefore if we want to learn and educate people they really need to be portrayed within reason.