Clausen was born on October 14, 1947, in
New Orleans, Louisiana. He graduated from
Hammond High School (Louisiana) in 1965 and attended
Southeastern Louisiana University for six months before enlisting in the
U.S. Marine Corps Reserve in New Orleans on March 30, 1966. He was discharged to enlist in the regular
Marine Corps on May 27, 1966. Private Clausen received
recruit training with the 3rd Recruit Training Battalion, Recruit Training Regiment,
Marine Corps Recruit Depot, San Diego, California, and individual combat training with the 3rd Battalion, 2nd
Infantry Training Regiment at
Camp Pendleton, California. He then completed Aviation Mechanical Fundamentals School and the Basic Helicopter Course at Naval Air Technical Training Center in
Memphis, Tennessee. He completed his training in April 1967 and was transferred to Marine Aircraft Group 26 (
MAG-26),
Marine Corps Air Facility, New River, Jacksonville, North Carolina, where he served as a jet engine mechanic with Marine Medium Helicopter Squadron 365 (
HMM-365) and, later, as a guard with Marine Air Base Squadron 26 (
MABS-26). In December 1967, Private First Class Clausen was ordered overseas to serve as a jet helicopter mechanic, which he did throughout his tour of active duty service. He joined the
1st Marine Aircraft Wing,
Fleet Marine Force, Pacific, with Headquarters and Maintenance Squadron 36
(H&MS-36),
Marine Aircraft Group 36 (MAG-36) until September 1968, then with
HMM-364,
Marine Aircraft Group 16 (MAG-16) until the following August. PFC Clausen then returned to the United States, where he joined
Marine Aircraft Group 26 (MAG-26) at
Marine Corps Air Station New River for duty with
HMM-261. He began his second tour of duty in November 1969 with
HMM-263, MAG-16,
1st Marine Aircraft Wing,
Fleet Marine Force, Pacific. On January 31, 1970, as part of a mission to rescue Marines who were stranded in a minefield near Da Nang, under heavy enemy fire, he made six trips out of his
CH-46 Sea Knight helicopter through the minefield, carrying back eleven wounded Marines and one dead until the last Marine was accounted for. On August 19, 1970, upon his return to the United States, he was released from active duty at the rank of PFC. On June 15, 1971, he was presented the Medal of Honor by President
Richard M. Nixon in a ceremony at the
White House. Private First Class Clausen died at the age of 56 on May 30, 2004, at
Baylor University Medical Center,
Dallas, Texas, due to
liver failure. He was buried at Ponchatoula Cemetery in
Ponchatoula, Louisiana, with
full military honors. ==Awards and decorations==