This is a U.S. Marine Regiment stationed in Samoa, from a website about them:http://www.ranger95.com/marines/regiments/3rd_rgt/3rd_marine...
"The 3rd Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Base Hawaii. They fall under the 3rd Marine Division and the III Marine Expeditionary Force.
The regiment comprises three infantry battalions and one headquarters company. Also, because of the geographic isolation, an artillery battalion (1/12) also falls under the regiment:
1st Battalion 3rd Marines
2nd Battalion 3rd Marines
3rd Battalion 3rd Marines
1st Battalion 12th Marines
(the website has underlined links with information on each)
World War II
The 3rd Marine Regiment was reactivated on June 16, 1942, at New River, North Carolina, as part of the World War II military expansion. They deployed to American Samoa on September 14, 1942 and were attached to the 2nd Marine Brigade. The regiment redeployed to New Zealand on May 23, 1943 and were reassigned to the 3rd Marine Division at that time. The regiment fought at Bougainville and Guam. Four Medals of Honor were awarded to members of 3rd Marines for actions during this period.
Following World War II, the regiment was ordered to China to aid in the disarming of Japanese units and to assist the Nationalist government in the occupation of Northern China in an effort to deny land to the communists..."
Try an internet search for reunion sites or Veterans sites about this unit.