I was recently at the DCFD Marine Unit Headquarters along the Washington Channel, which is also the home for the Washington Police Department Marine and Dive Unit.
Located a bit farther down the channel is the Anacostia Helicopter Facility, home of the Presidential Helicopters.
While I was outside, I saw a couple of the Sikorsky VH-60N White Hawks used for presidential transportation and had to grab some shots despite the dreary, overcast conditions.