The Vietnam War called into question the U.S. Army doctrine. Marine Corps General Victor H. Krulak heavily criticised Westmoreland's attrition strategy, calling it "wasteful of American lives... with small likelihood of a successful outcome." In addition, doubts surfaced about the ability of the military to train foreign forces.
Between 1965 and 1975, the United States spent $111 billion on the war ($686 billion in FY2008 dollars). This resulted in a large federal budget deficit.
More than 3 million Americans served in the Vietnam War, some 1.5 million of whom actually saw combat in Vietnam. James E. Westheider wrote that "At the height of American involvement in 1968, for example, there were 543,000 American military personnel in Vietnam, but only 80,000 were considered combat troops."
Conscription in the United States had been controlled by the President since World War II, but ended in 1973."
By war's end, 58,220 American soldiers had been killed, more than 150,000 had been wounded, and at least 21,000 had been permanently disabled. According to Dale Kueter, "Sixty-one percent of those killed were age 21 or younger. Of those killed in combat, 86.3 percent were white, 12.5 percent were black and the remainder from other races." The youngest American KIA in the war was PFC Dan Bullock, who had falsified his birth certificate and enlisted in the US Marines at age 14 and who was killed in combat at age 15. Approximately 830,000 Vietnam veterans suffered symptoms of posttraumatic stress disorder. An estimated 125,000 Americans fled to Canada to avoid the Vietnam draft, and approximately 50,000 American servicemen deserted. In 1977, United States President Jimmy Carter granted a full, complete and unconditional pardon to all Vietnam-era draft dodgers. The Vietnam War POW/MIA issue, concerning the fate of U.S. service personnel listed as missing in action, persisted for many years after the war's conclusion.