From Jan 2017 in the freaking NY Post of all places:
“But military officials balked because of the optics of having tanks and missile launchers rumbling down Pennsylvania Avenue — and because the tanks, which often weigh more than 100,000 pounds, would destroy the roads, the source said.
“I could absolutely see structural support being a reason [not to use tanks],” a Department of Defense official said. “DC is built on a swamp to begin with.”
