I could'nt really tell for sure what they were ... Were they tracked or wheeled ? Did they have 50's or 20mm canon on top ?
In the 80's I watched vehicals similar to these patrol DC when certain were happening ... One I remember was when 200k pro lifers marched towards @ 200 k prochoicers ..I saw a few of these APC 6wheeled and 4wheeled with twin 50's on top open fire with rubber rnds bouncing in front of the crowds ricoceting and knocking the people back .
Another time was when the "Grease Man" disjockey on Dc 101 fm radio as part of a joke on the first MLK day said "WTF lets shoot four more and take the fn week off" ... yea the town erupted then ... we wrapped it up an left after what we saw what was happening....YEa DC has tanks & has had um for a while