Camp Atterbury officials are reporting that a soldier died last week during training there.

A base spokesman says that 43-year-old Capt. Brian A. Stillman was participating in the base’s land navigation training when he collapsed and died at about 12:30 p.m. Friday afternoon.

Stillman was from Norton, Ohio and was a 19-year-member of the Ohio National Guard. He was operations officer for the 2nd Battalion, 174th Air Defense Artillery Brigade. He is survived by his wife and two children.

Officials say the cause of death is still under investigation.