My first reaction was against it. It sounds like May Day in the USSR. Yet my second, third, and fourth thoughts were more positive. We attended the Edinburgh Tatoo, and there didn't seem to be anything troubling about the display. A parade might not be that different. The parades of my childhood included military groups, including bands - sometimes current, sometimes veterans.
I think bands and uniforms would be more important than tanks, other than a few to to be cool so that boys can go wide-eyed. Drill maneuvers with rifles, specialty units, long massed lines marching in unison - it doesn't sound so bad. It might end up falling flat and looking a bit ridiculous. But this is exactly the sort of thing that Donald Trump intuits better than the rest of us reason. It might be inspiring.
I also remember the predictions of how terrible the Vietnam Veterans Memorial Wall would be greeted when it was first proposed and then built. It was dark and grim, and its sinking into the ground looked like a celebration of failure, we were told. Well, it didn't work out that way, did it? We don't really know what will inspire us sometimes. It will b e a great inconvenience for the active military. I get that. But it might work magic on the rest of us.