Buker was born on November 3, 1949, in Benton, Maine, the youngest of four sons of Opal Buker Clark.He grew up in Benton and graduated from Lawrence High School in nearby Fairfield in 1967. His brothers, Victor, Gerald, and Alan, also served in the Vietnam War.
Buker joined the Army from Bangor, Maine, and by April 5, 1970 was serving as a sergeant in Detachment B-55, 5th Special Forces Group, 1st Special Forces. On that day, he was acting as a platoon advisor for a Vietnamese mobile strike force company on a mission in Chau Doc Province, Republic of Vietnam. When his platoon came under intense fire, he single-handedly destroyed one enemy bunker was seriously wounded, and then destroyed another bunker despite these wounds. He was killed later in the battle as he reorganized his soldiers
For these actions, Buker was posthumously awarded the Medal of Honor. His other decorations include a Bronze Star, Purple Heart, and Vietnamese Gallantry Cross. On September 15, 2010, Buker's family donated his Medal of Honor and other decorations to his alma mater, Lawrence High School in Fairfield, for display.
Buker, aged 20 at his death, was buried at Brown Cemetery in his hometown of Benton
On September 15, 2010, Buker's family donated his Medal of Honor and other decorations to his alma mater, Lawrence High School in Fairfield, Maine. A picture of the display is shown below, as well as, the SFA plaque donated to his High School by chapter 72..