This fight is also about much more than just Iraq.
Look at this from the Vietnam timeline site:
http://www.historyplace.com/unitedstates/vietnam/index-1965.html
1966
January 31, 1966- Senator Robert F. Kennedy criticizes President Johnson's decision to resume the bombing, stating that the U.S. may be headed "on a road from which there is no turning back, a road that leads to catastrophe for all mankind." His comments infuriate the President.
February 1966 - The Senate Foreign Relations Committee, chaired by Sen. J. William Fulbright, holds televised hearings examining America's policy in Vietnam. Appearing before the committee, Defense Secretary McNamara states that U.S. objectives in Vietnam are "not to destroy or overthrow the Communist government of North Vietnam. They are limited to the destruction of the insurrection and aggression directed by North Vietnamese against the political institutions of South Vietnam."
February 3, 1966 - Influential newspaper columnist Walter Lippmann lambastes President Johnson's strategy in Vietnam, stating, "Gestures, propaganda, public relations and bombing and more bombing will not work." Lippmann predicts Vietnam will divide America as combat causalities mount.
1971
March 29, 1971 - Lt. William Calley is found guilty of the murder of 22 My Lai civilians. He is sentenced to life imprisonment with hard labor, however, the sentence is later reduced to 20 years, then 10 years. Out of 16 military personnel charged with offenses concerning the My Lai massacre, only five were actually court-martialed, and only Calley was ever found guilty.
April 1, 1971 - President Nixon orders Calley released pending his appeal.
April 19, 1971 - 'Vietnam Veterans Against the War' begin a week of nationwide protests.
April 24, 1971 - Another mass demonstration is held in Washington attracting nearly 200,000.
April 29, 1971 - Total American deaths in Vietnam surpass 45,000.
April 30, 1971 - The last U.S. Marine combat units depart Vietnam.
May 3-5 - A mass arrest of 12,000 protesters occurs in Washington.
June 1971 - During a college commencement speech, Senator Mike Mansfield labels the Vietnam war "a tragic mistake."
June 13, 1971 - The New York Times begins publication of the 'Pentagon Papers,' a secret Defense Department archive of the paperwork involved in decisions made by previous White House administrations concerning Vietnam. Publication of the classified documents infuriates President Nixon.
1973
March 29, 1973 - The last remaining American troops withdraw from Vietnam as President Nixon declares "the day we have all worked and prayed for has finally come."
America's longest war, and its first defeat, thus concludes. During 15 years of military involvement, over 2 million Americans served in Vietnam with 500,000 seeing actual combat. 47,244 were killed in action, including 8000 airmen. There were 10,446 non-combat deaths. 153,329 were seriously wounded, including 10,000 amputees. Over 2400 American POWs/MIAs were unaccounted for as of 1973.
April 1973 - President Nixon and President Thieu meet at San Clemente, California. Nixon renews his earlier secret pledge to respond militarily if North Vietnam violates the peace agreement.
April 1, 1973 - Captain Robert White, the last known American POW is released.
April 30, 1973 - The Watergate scandal results in the resignation of top Nixon aides H.R. Haldeman and John Ehrlichman.
June 19, 1973 - The U.S. Congress passes the Case-Church Amendment which forbids any further U.S. military involvement in Southeast Asia, effective August 15, 1973. The veto-proof vote is 278-124 in the House and 64-26 in the Senate.
The Amendment paves the way for North Vietnam to wage yet another invasion of the South, this time without fear of U.S. bombing.
June 24, 1973 - Graham Martin becomes the new U.S. ambassador to South Vietnam.
July 1973 - The U.S. Navy removes mines from ports in North Vietnam which had been installed during Operation Linebacker.
July 16, 1973 - The U.S. Senate Armed Forces Committee begins hearings into the secret bombing of Cambodia during 1969-70.
July 17, 1973 - Secretary of Defense James Schlesinger testifies before the Armed Forces Committee that 3500 bombing raids were launched into Cambodia to protect American troops by targeting NVA positions. The extent of Nixon's secret bombing campaign angers many in Congress and results in the first call for Nixon's impeachment.
August 14, 1973 - U.S. bombing activities in Cambodia are halted in accordance with the Congressional ban resulting from the Case-Church amendment.
1975
April 23, 1975 - 100,000 NVA soldiers advance on Saigon which is now overflowing with refugees. On this same day, President Ford gives a speech at Tulane University stating the conflict in Vietnam is "a war that is finished as far as America is concerned."
April 27, 1975 - Saigon is encircled. 30,000 South Vietnamese soldiers are inside the city but are leaderless. NVA fire rockets into downtown civilian areas as the city erupts into chaos and widespread looting.
April 28, 1975 - 'Neutralist' General Duong Van "Big" Minh becomes the new president of South Vietnam and appeals for a cease-fire. His appeal is ignored.
April 29, 1975 - NVA shell Tan Son Nhut air base in Saigon, killing two U.S. Marines at the compound gate. Conditions then deteriorate as South Vietnamese civilians loot the air base. President Ford now orders Operation Frequent Wind, the helicopter evacuation of 7000 Americans and South Vietnamese from Saigon, which begins with the radio broadcast of the song "White Christmas" as a pre-arraigned code signal.
At Tan Son Nhut, frantic civilians begin swarming the helicopters. The evacuation is then shifted to the walled-in American embassy, which is secured by U.S. Marines in full combat gear. But the scene there also deteriorates, as thousands of civilians attempt to get into the compound.
Three U.S. aircraft carriers stand by off the coast of Vietnam to handle incoming Americans and South Vietnamese refugees. Many South Vietnamese pilots also land on the carriers, flying American-made helicopters which are then pushed overboard to make room for more arrivals. Filmed footage of the $250,000 choppers being tossed into the sea becomes an enduring image of the war's end.
April 30, 1975 - At 8:35 a.m., the last Americans, ten Marines from the embassy, depart Saigon, concluding the United States presence in Vietnam. North Vietnamese troops pour into Saigon and encounter little resistance. By 11 a.m., the red and blue Viet Cong flag flies from the presidential palace. President Minh broadcasts a message of unconditional surrender. The war is over.
How long will it take this time? What lessons can we learn and will we ever learn them or will we have another immoral 'war of choice' in another 20 years? What is the role of Congress in declaring war and how should the legislative branch respond when the President decideds to lie, cheat, steal and frame his way into a war? What are the limits of power here, just what are the limits of power?