24 February American and South Vietnamese troops capture the Citadel in Hue.
25 February American forces declare the city of Hue secure.
29 February Operation Saline is combined with Operation Napoleon.
February The 27th Marines arrives in Da Nang from the U.S. as part of the reinforcements approved by President Lyndon B. Johnson. The President made extensive reductions to original recommendations of MACV and the JCS.
February Operation Kentucky results in 398 reported enemy casualties with 90 Marines killed and 277 wounded.
1 March Clark Clifford replaces Robert S. McNamara as Secretary of Defense.
2 March Operation Hue City ends successfully as the 1st and 5th Marines defeat the NVA assault in Hue. The operation resulted in 1,943 enemy casualties with 142 Marines killed and 1,005 wounded.
10 March MACV Forward is deactivated.
10 March Provisional Corps Vietnam is created. This command, led by Lieutenant General William B. Rosson, USA, controls the 3rd Marine Division, the 1st Air Cavalry Division, and the 101st Airborne Division and is subordinate to Lieutenant General Cushman, commander of III MAF.
12 March Senator Eugene McCarthy makes a substantial showing in the New Hampshire primary, winning 40 percent of the vote, with President Johnson winning 49 percent.
16 March Troops from the Americal Division massacre more than 100 civilians, mostly women and children, in the village of My Lai.
21 March As part of the Single Management System, the Seventh Air Force assumes responsibility for coordinating and controlling all fixed-wing aircraft missions, including those of the 1st Marine Aircraft Wing.
31 March Operation Scotland (lNov67-31Mar68) near Khe Sanh ends. The operation, which included the defense of the besieged garrison of Khe Sanh, resulted in a reported 1,631 enemy casualties with 204 Marines killed and 1,622 wounded in action.
31 March The 1st Cavalry Division concludes Operation Jeb Stuart. This operation resulted in a reported 3,268 enemy casualties with 284 Army personnel killed and 1,717 wounded.
31 March President Johnson announces a partial halt in the bombing of North Vietnam and that he will send an additional 13,500 troops to South Vietnam. In a surprise move, the President declares that he will not run for re-election due to the war in Vietnam and public unrest at home. March Operation Kentucky results in a reported 413 enemy casualties with 38
Marines killed and 217 wounded.
l April The 1st Air Cavalry Division together with units from the 1st Marines and the ARVN, begins Operation Pegasus from the Marine base of Ca Lu to relieve the Marine garrison at Khe Sanh. 9 April U. S. troops retake the Special Forces Camp at Lang Vei, southwest of Khe
15 April Operation Pegasus ends with the relief and resupply of Khe Sanh. The operation resulted in 1,044 reported enemy casualties, with 51 Marines killed and 459 wounded. The 1st Air Cavalry Division suffered 41 personnel killed and 208 wounded.
15 April With the relief of Khe Sanh and the end of Operation Pegasus, Operation Scotland II, a continuation of Marine Corps action around the base at Khe Sanh begins.