We may have a wide alert, but it sure seems focused on Yemen, given a drone strike, evacuation of US personnel, and the presence of Marines nearby:
There are 2,000 Marines from the 26th Marine Expeditionary Unit from Camp Lejeune. They are aboard three warships: the USS Kearsarge, USS Carter Hall and USS San Antonio.
About 1,200 of them comprise a "battalion landing team" that could be used in a crisis. But they also have V-22 tilt rotor aircraft to carry Marines and helicopter gunships that could be used in combat or counter terrorism operations.
Plus other assets in Spain and Bahrain specifically earmarked for such missions.
UPDATE: Huh. Gunfire in Derna, Libya, and we are involved. According to television news.