This is definitely (hopefully) something you would not see today. It’s a large parade of tanks heading from the Capitol Building towards the White House.
![tanks rolling down Pennsylvania Ave. NW](https://ghostsofdc.org/wp-content/uploads/sites/7/2013/09/tnkas-penn-ave.jpg)
Source: National Geographic
The caption claims it’s 1947, but the discussion on Reddit seem to point to a time during World War II.