Seward Square

Seward Square is the section of Washington, DC where Reilly's Rangers' Compound is located.

Mad preacher with the nukes
There is a man standing on the second floor of a building in an alleyway near the headquarters entrance. The alley has been rigged with mines and nukes that he detonates if you try to get close to him. There is a hostage on one end of the alley, who you can talk to.

If your stealth is high enough, you can sneak through and pick up the frag mines and multiple mininuke. Not advisable without the Light Step perk You can talk the hostage into confronting the man, but he gets blown up in the mine field. Only other solution appears to be sniping the loudspeaker guy from a distance.