Indeed, no type mentioned (yet)...
http://www.africom.mil/getArticle.asp?art=7635
STATEMENT: U.S. Aircraft Crashes in Djibouti, Four Fatalities
By U.S. Africa Command Public Affairs
U.S. AFRICOM Public Affairs
STUTTGART, Germany,
Feb 19, 2012 — During a routine flight, a U.S. military aircraft crashed approximately six miles from the Djibouti International Airport, Djibouti, February 18, 2012.
All four U.S. military personnel on board died.
The accident occurred at approximately 8 p.m. local. U.S. military personnel were dispatched to the scene to provide immediate response assistance and secure the crash site.
A safety board investigation has been initiated to determine the exact cause of the incident.
The names of the service members will not be released until after the primary next of kin have been notified.