Officials have released the identities of three of the four U.S. soldiers found dead in Lithuania.

The soldiers discovered in a submerged M88 armored vehicle in a marshland were all under 25 years of age. Officials identified them on Tuesday as Sgt. Jose Duenez, Jr., 25, from Joliet, Illinois; Sgt. Edvin F. Franco, 25, from Glendale, California; and Pfc. Dante D. Taitano, 21, from Dededo, Guam.

A fourth soldier was found on Tuesday, but his identity has not yet been released.

“This loss is simply devastating,” Maj. Gen. Christopher Norrie, the 3rd Infantry Division commanding general, said in a statement.

“These individuals were esteemed members of the Marne Division. We are extending our support to the families and loved ones of our Soldiers during this incredibly challenging period.”