Military gear seldom sits in mothballs. There are training drills, exercises, and testing going on all the time.
If you add up fuel costs to move the gear to DC, the $92 Million cost seems brutishly exaggerated.
We don't need some overblown national tribute, what we do need is to bring back the military into small local events and parades on those holidays that they are appropriate for. Unfortunately the left has been too successful in driving pride for America and the military out of our children for decades with the result being that the socialists in charge of our cities have eliminated any outward show of respect with barely a whimper of protest.