70 years ago today, on February 26th, 1945, he was involved in combat on Iwo Jima and was responsible for taking 16 positions of various sizes and killing about 75 of the enemy.
You can think about just what sort of over the top action it must have been to get noticed on Iwo Jima to the extent that the Marine Corps would push forward documentation for a Medal of Honor. Here's what Harry Truman signed for the award:
PRIVATE FIRST CLASS DOUGLAS T. JACOBSON
UNITED STATES MARINE CORPS RESERVEfor service as set forth in the following CITATION:For conspicuous gallantry and intrepidity at the risk of his life above and beyond the call of duty while serving with the Third Battalion, Twenty-Third Marines, Fourth Marine Division, in combat against enemy Japanese forces during the seizure of Iwo Jima in the Volcano Islands, February 26, 1945. Promptly destroying a stubborn 20-mm. antiaircraft gun and its crew after assuming the duties of a bazooka man who had been killed, Private First Class Jacobson waged a relentless battle as his unit fought desperately toward the summit of Hill 382 in an effort to penetrate the heart of Japanese cross-island defenses. Employing his weapon with ready accuracy when his platoon was halted by overwhelming enemy fire on February 26, he first destroyed two hostile machine-gun positions, then attacked a large blockhouse, completely neutralizing the fortification before dispatching the five-man crew of a pillbox and exploding the installation with a terrific demolitions blast. Moving steadily forward, he wiped out an earth-covered rifle emplacement and, confronted by a cluster of similar emplacements which constituted the perimeter of enemy defenses in his assigned sector, fearlessly advanced, quickly reduced all six positions to a shambles, killed ten of the enemy and enabled our forces to occupy the strong point. Determined to widen the breach thus forced, he volunteered his services to an adjacent assault company, neutralized a pillbox holding up its advance, opened fire on a Japanese tank pouring a steady stream of bullets on one of our supporting tanks and smashed the enemy tank's gun turret in a brief but furious action culminating in a single-handed assault against still another blockhouse and the subsequent neutralization of its firepower. By his dauntless skill and valor, Private First Class Jacobson destroyed a total of sixteen enemy positions and annihilated approximately seventy-five Japanese, thereby contributing essentially to the success of his division's operations against the fanatically defended outpost of the Japanese Empire. His gallant conduct in the face of tremendous odds enhanced and sustained the highest traditions of the United States Naval Service.(Signed) HARRY S. TRUMAN