Born in What Cheer, Iowa to Harry & Elizabeth Barker on October 2, 1917, Harry Bernard Barker had two brothers and a sister.
He attended Grinnell College and after graduation enlisted in the Marine Corps on May 14, 1941.

Commissioned as an officer in October 1941, Harry first saw action on September 22, 1943 in command of a special 35 man party of Army, Navy, Marines and locals landed by a submarine on Bougaiville. They scouted for landing areas for the 3rd Marine Division.

Harry was later made Commanding Officer of Company L, 3rd Battalion, 9th Marine Regiment, 3rd Marine Division.
On July 21, 1944, he was Killed in Action leading his Marines after landing at Blue Beach on Guam.

Posthumously awarded the Navy Cross, his citation mentions;

“The President takes pride in presenting the Navy Cross (Posthumously) to Captain Harry B Barker USMCR, for extraordinary heroism as Commanding Officer of Company L, Third Battalion, Ninth Marines, THIRD Marine Division, in action against enemy Japanese forces on the Asan-Adelup Beachhead, Guam, Marianas Islands, on 21 July 1944. Landing on the heavily fortified, fire-swept beachhead with the forward elements on D-Day, Captain Barker immediately moved inland to reconnoiter the area then, returning to his troops, promptly led them to the best vantage point for supporting the forward assault units. Critically wounded in the right arm by a Japanese sniper's bullet, he steadfastly refused first aid until the situation had been stabilized. Then, after having his wound dressed, he subsequently returned to his troops and personally led them in a vigorous, intensive assault against a hill vital to the advance of our forces despite withering enemy fire which swept the area. Although he was mortally wounded during the fierce action, Captain Barker, by his valiant and aggressive leadership had contributed to the success of our sustained drive toward the recapture of this important enemy stronghold, and his unwavering devotion to duty in the face of grave peril reflects the highest credit upon the United States Naval Service. He gallantly gave his life for his country.”

His remains were returned to the USA in 1950 and Captain Harry Barker was buried at Saint Josephs Cemetery in What Cheer, Iowa.

Older brother Edward Russell Barker Sr also served in the Marine Corps during WW2, he passed away at the age of 59 in 1975.

Source: The Art of Manliness