147th Ohio.

This is coolbert:

Always thought the Battle of  Iwo Jima strictly an affair of the U.S. Marine Corps. Ground action sans U.S. Army. Not so. From the wiki combat action  continuing to occur for three months after the island as deemed captured and secure.

147th Regiment Ohio National Guard [ONG] performing yeoman duty under trying circumstances.

"yeoman's/yeoman work/service : very good, hard, and valuable work that someone does especially to support a cause, to help a team, etc."

As extracted from the wiki:

"Once the island was declared secure, the regiment was ostensibly there to act as a garrison force, but they soon found themselves locked in a bitter struggle against thousands of stalwart [Japanese] defenders engaging in a last-ditch guerilla campaign to harass the Americans. Using well-supplied caves and tunnel systems, the Japanese resisted American advances. For three months, the 147th methodically scoured the island, using flamethrowers, grenades, and satchel charges to ferret out the enemy. 1,602 Japanese were officially credited as killed, and 867 captured, with potentially thousands more sealed up in caves using explosives. Some sources credit the regiment with killing at least 6,000 Japanese soldiers in those anonymous and merciless small unit actions. In return, the 147th suffered fifteen men killed in action and 144 wounded."

Go 147th Ohio! Job well done.

The Japanese soldier during WW2 well known for his determination and willingness to fight to the dead 100 %. Surrender not an option even if the situation totally forlorn and hopeless. The die-hard mentality carried to the fullest measure.

"die-hard adjective: strongly or fanatically determined or devoted"

coolbert.