An Army laboratory in Hawaii has identified the remains of six American military officers missing from the Vietnam war, the Defense Department said yesterday.

Five of the six were in the same group of remains, repatriated to the United States by Vietnam last November. The remains of the sixth had been repatriated in August 1985, but efforts to identify him had been unsuccessful until recently, the Pentagon said.

The missing men, all aviators, were identified as:

Air Force Col. Franklin A. Caras, lost over North Vietnam April 28, 1967. He was born Jan. 19, 1934, and listed his home as Spanish Fork, Utah.

Air Force Col. Oscar M. Dardeau Jr., lost over North Vietnam Nov. 18, 1967. He was born on Dec. 11, 1931, and listed his home as Ville Platte, La.

Navy Capt. Trent R. Powers, lost over North Vietnam Oct. 31, 1965. He was born Aug. 24, 1930, and listed his home as Minneapolis.

Air Force Lt. Col. Edward W. Lehnhoff, lost over North Vietnam Nov. 18, 1967. He was born March 14, 1936, and listed his home as Fort Scott, Kan.

Navy Cmdr. Edwin B. Tucker, lost over North Vietnam April 24, 1967. He was born Feb. 1, 1935, and listed his home as Baldwinville, Mass.

Navy Lt. Clemie McKinney, lost over South Vietnam April 14, 1972. He was born April 25, 1945, and listed his home as Cleveland.

All six remains were identified by the Central Identification Laboratory in Honolulu. With the latest identifications, 2,404 Americans are still listed as missing in Indochina as a result of the Vietnam war. Of them, 1,767 are listed as missing in either North or South Vietnam, the Pentagon said.