PENSACOLA, Fla.  — Seven Marines and four soldiers were missing early today after an Army helicopter crashed during a night training exercise at Eglin Air Force Base in the Florida Panhandle.

Base officials said the Marines are part of a Camp Lejeune-based special operations group and the soldiers were from a Hammond, Louisiana-based National Guard unit.

The helicopter was reported missing around 8:30 p.m. Tuesday and search and rescue crews found debris from the crash around 2 a.m. today, Eglin spokesman Andy Bourland said.

“At this time all are missing,” Bourland said.

Names of those involved were being withheld pending notification of next of kin, he said.