The official caption says this is part of a pro-war demonstration in Denver and that these Coloradans are marching on the capitol. Which tells me one thing: both pro- and anti-war marchers have an equal capacity for nonsense.
I think historical recreation is interesting if it tells us something about history; it reminds us what conditions were like and such. And this is kinda interesting if it gives us a fresh look at what US soldiers looked like all along.
But as a pro-war demonstration, it's kinda dumb; all it does is remind us that we have a military tradition. If anything, this image says "let's go to war, because that's what we always do!"