Sniper rifle heck thats a Barrett .50 cal.
It is indeed a .50 cal. You might think it would be overkill in Lafayette park, but the trick is that it will stop a car. Right f'n now.
When you can't really use a rocket launcher a .50 cal is the next best thing
Seriously though, I think the Barrett is present in an anti-vehicle capacity rather than an anti-personnel role.
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
I think its in 7mm or .300 magnum or ultra magnum. Ive heard firsthand that 7mm was a favored round for some with WH duties in the past too FWIW