YOKOSUKA NAVAL BASE, Japan – A Navy boot camp recruit died after collapsing during physical training at Naval Station Great Lakes, Navy officials said Friday.

Seaman Recruit Christopher Walker, 19, of Kittanning, Pa., died during training at Recruit Training Command on Wednesday, according to a news release.

Walker collapsed during a 1½-mile run, the first part of a physical fitness test that also included push-ups and sit-ups, said Navy spokesman Mike Miller, according to a Chicago Tribune report on Thursday.

Walker had completed two earlier fitness tests, and the run was part of his last prior to next week’s graduation, Miller told the Chicago Tribune.

Lake County Coroner Artis Yancey told the Chicago Daily Herald that a cause of death couldn’t be determined following an autopsy Thursday. Yancey said his office had “a hunch” that Walker had undiagnosed diabetes, so toxicology tests focusing on Walker’s blood sugar levels would soon be administered, the Daily Herald reported.

Walker was pronounced dead at Lovell Federal Health Care Center in North Chicago at about 10 a.m. Wednesday, according to the Navy news release.

Navy officials are still investigating the details of the incident, officials said Friday.

Walker enlisted Nov. 16 and was scheduled to attend follow-on training as a machinist’s mate, Navy officials said.

 Pfc. Michael W. Pyron, 30, of Hopewell, Va., died Jan. 10 in Parwan province, Afghanistan. He was assigned to the 25th Signal Battalion, 160th Signal Brigade, 335th Signal Command Theater, East Point, Ga.

 Pfc. Neil I. Turner, 21, of Tacoma, Wash., died Jan. 11, in Logar province, Afghanistan, of injuries sustained from a non-combat related incident. He was assigned to the 1st Battalion, 41st Infantry Regiment, 3rd Brigade Combat Team, 1st Armored Division, Fort Bliss, Texas.

Spc. Pernell J. Herrera, 33, of Espanola, N.M., died Dec. 31, in Helmand province, Afghanistan, of injuries suffered in a non-combat incident. He was assigned to the 1st Battalion, 171st Aviation Regiment, Santa Fe, N.M.

FORT RILEY, Kan. — Officials are investigating the death of a 22-year-old Fort Riley soldier at the northeast Kansas Army post.

The soldier was identified as Pfc. Michael Webb, of Supply, N.C. The Topeka Capital Journal reports Webb died Thursday. He was assigned to the 1st Engineer Battalion, 4th Infantry Brigade Combat Team, 1st Infantry Division.

The cause of Webb’s death wasn’t available Saturday.

SASEBO NAVAL BASE, Japan — The Navy has identified the sailor who died Nov. 23 aboard the USS Essex while the ship was anchored off Bali, Indonesia.

Petty Officer 1st Class Regan Young, 37, lost consciousness after suffering blunt trauma during a daily check of the ship’s weapons systems, Navy officials said. The ship’s Fleet Surgical Team tried unsuccessfully to revive him and he was pronounced dead on board, officials said.

Young, a personnel specialist on the Essex, is survived by his wife and children, according to a statement released Thanksgiving Day on Facebook by Capt. David Fluker, commander of the Wasp-class multipurpose amphibious assault ship.

Citing an ongoing investigation, Navy officials declined to comment further on the incident — including why a sailor in personnel was near weapons systems that were being checked.

Spc. Phillip S. Bullins, 23, of Carthage, N.C., died at the scene of a vehicle accident at Schofield Barracks, Hawaii on November 26, 2011. Bullins joined the Army in September 2009 and was assigned to the 25th Infantry Division.

Fort Bragg, N.C. — The death of an 82nd Airborne Division paratrooper who died Wednesday during physical training at Fort Bragg is under investigation, the U.S. Army announced Friday.

Master Sgt. Eldridge Jackson served as the first sergeant of Headquarters and Headquarters Battery, 3rd Battalion, 319th Airborne Field Artillery Regiment, 1st Brigade Combat Team.

An Alabama native, he joined the Army in 1988 and served as an artilleryman. His numerous deployments included two to Iraq and, most recently, one to Afghanistan.

HONOLULU — The Hawaii National Guard has identified a soldier who died on Kauai as Sgt. 1st Class Eric Yasuji Fujiwara.

The Guard said in a statement Thursday the 54-year-old light-wheeled mechanic died while on duty at a vehicle maintenance shop in Hanapepe.

Fujiwara had just finished some physical training and was still wearing his workout clothes when a fellow soldier found him unresponsive on Wednesday.

Soldiers performed CPR, and Fujiwara was taken to Kauai Memorial Veterans Memorial Hospital. He was pronounced dead at 1 p.m.

The Guard said it’s not clear what caused his death.

Fujiwara served with the Guard for 37 years. He deployed twice with the 29th Infantry Brigade Combat Team — once to Iraq and once to Kuwait.

Spc. Ronnie V. Pasion, 23, of the Joint Multinational Readiness Center, died Oct. 18 in a “vehicle-related incident” off the A6 near Leuchtenberg, according to a spokesman for the JMRC, who declined to elaborate. A German newspaper reported a soldier was killed on the same date and location after being hit by a passing truck when he got out of his car on the autobahn shoulder.