Washington ? The military has identified remains of nine Navy crew members — one of them from Kansas — killed when their surveillance plane crashed in Laos during the Vietnam War, the Pentagon announced Tuesday.

The nine will be buried June 18 in a joint observance at Arlington National Cemetery.

The men were aboard a Navy OP-2E Neptune plane that crashed into a mountain in Laos in January 1968. The remains were recovered during six U.S.-Lao missions to the crash site between 1993 and last year, the Pentagon said.

The crew members:

• Capt. Delbert A. Olson of Casselton, N.D.
• Lt. j.g. Dennis L. Anderson of Hope, Kan.
• Lt. j.g. Arthur C. Buck of Sandusky, Ohio.
• Lt. j.g. Philip P. Stevens of Twin Lake, Mich.
• Petty Officer 2nd Class Richard M. Mancini of Amsterdam, N.Y.
• Petty Officer 2nd Class Michael L. Roberts of Purvis, Miss.
• Petty Officer 2nd Class Donald N. Thoresen of Detroit.
• Petty Officer 2nd Class Kenneth H. Widon of Detroit.
• Petty Officer 3rd Class Gale R. Siow of Huntington Park, Calif.

Their plane left a base in Thailand on Jan. 11, 1968, on a mission to drop sensors in Laos to detect enemy movements. The crew reported their plane’s descent through dense clouds in its last radio transmission.

Two weeks after the crash, an Air Force crew photographed what was believed to have been the crash site, but enemy activity in the area prevented a recovery operation, the statement said.