When the North Vietnamese military renewed Recovering their offensive early in 1975 , the RVNAF was handicapped Hindering and many of their aircraft were either lost Earnings_and_losses or captured Conquering as formations of the People 's Army of Vietnam ( PAVN ) swept Scrutiny through the Central Highlands of South Vietnam .

After the initial success capturing Control Phước Long Province , the North Vietnamese leadership increased Cause_change_of_position_on_a_scale the scope of the People 's Army of Vietnam 's ( PAVN ) offensive Attack and captured Control and held the key Central Highlands city of Buôn Ma Thuột between March 10 and 18 .

With PAVN spearheads already entering Arriving Saigon , the South Vietnamese government , then under the leadership of Dương Văn Minh , capitulated Surrendering on 30 April 1975 .

Operation Prairie was a U.S. military operation in Quảng Trị Province , South Vietnam that sought to eliminate People 's Army of Vietnam ( PAVN ) forces south of the Demilitarized Zone ( DMZ ) .

The majority of the activities were conducted Action by the 3rd Marine Division in the Con Thien and Gio Linh regions with the main objective of stopping the PAVN 324B Division from crossing the demilitarized zone and invading Quang Tri Province .

It was replaced Change_of_leadership by other PAVN units , but these remained Temporary_stay inactive .

They had lost Earnings_and_losses 226 Marines killed against estimated PAVN of over 1,700 dead or captured and suppressed PAVN activity .

They had lost Earnings_and_losses 226 Marines killed against estimated PAVN of over 1,700 dead or captured and suppressed PAVN activity .

However , the PAVN strategy had tied Connect down large numbers of US troops in the area south of the DMZ , leaving population centers under-protected .

Due to increasing Cause_change_of_position_on_a_scale U.S. intelligence of the build-up of regimental-size PAVN units operating Being_in_operation in South Vietnam , the increased Cause_change_of_position_on_a_scale American military presence Presence in that country , and the initiation of Operation Rolling Thunder , American planners in Washington and Saigon decided Deciding that the bombing Attack in southeastern Laos should be stepped up Cause_change_of_strength .

It was estimated by U.S. intelligence analysts Scrutiny that , during 1965 , 4,500 PAVN troops were infiltrated Self_motion through Laos along with 300 tons of materiel each month .

Operation Frequent Wind was the final phase in the evacuation of American civilians and `` at-risk '' Vietnamese from Saigon , South Vietnam prior to the takeover of the city by the North Vietnamese People 's Army of Vietnam ( PAVN ) in the Fall of Saigon .

`` Barrel Roll '' and the `` Secret Army '' attempted to stem Preventing_or_letting an increasing tide of People 's Army of Vietnam ( PAVN ) and Pathet Lao offensives .

The targets Aiming of these attacks Attack were sanctuaries and Base Areas of the People 's Army of Vietnam ( PAVN — commonly referred to during the Vietnam War Hostile_encounter as the North Vietnamese Army [ NVA ] ) and forces of the Viet Cong ( NLF ) , which utilized Using them for resupply Supply , training Education_teaching , and resting between campaigns Military_operation across the border in the Republic of Vietnam ( South Vietnam ) .

The impact Influence of the bombing Attack campaign on the Khmer Rouge guerrillas , the PAVN , and Cambodian civilians in the bombed areas is disputed Quarreling by historians .

The purpose of the operation was to interdict the flow Motion of People 's Army of Vietnam ( PAVN ) supplies Supply on the Ho Chi Minh Trail ( the Truong Son Strategic Supply Supply Route to the North Vietnamese ) from the Democratic Republic of Vietnam ( North Vietnam ) , through southeastern Laos , and into the northern provinces of the Republic of Vietnam ( South Vietnam ) .

Launched Using by Richard Nixon as a follow-up to the earlier ground invasion during the Cambodian Campaign , the initial targets of the operation were the base areas and border sanctuaries of the People 's Army of Vietnam ( PAVN ) and the Viet Cong ( VC ) .

The Fall Conquering of Saigon , also known as the Liberation Change_of_leadership of Saigon , was the capture Conquering of Saigon , the capital of South Vietnam , by the People 's Army of Vietnam ( PAVN ) and the Viet Cong on 30 April 1975 .

The PAVN , under the command Control of General Văn Tiến Dũng , began Process_start their final Process_end attack Attack on Saigon on April 29 , 1975 , with the Army of the Republic of Vietnam ( ARVN ) forces Hostile_encounter commanded Control by General Nguyễn Văn Toàn suffering Bodily_harm a heavy artillery bombardment Attack .

By the afternoon of the next day , the PAVN had occupied Control the important points of the city and raised Self_motion their flag over the South Vietnamese presidential palace .

The Tet Offensive of 1968 showed Presence the lack of progress with these doctrines as the NLF and PAVN mounted Connect large-scale urban offensives throughout 1968 , turning US domestic support against the war .

In 1969 , North Vietnam declared Expressing_publicly a Provisional Revolutionary Government in South Vietnam in an attempt to give the reduced NLF a more international stature , but the southern guerrillas from then on were sidelined as PAVN forces begun more conventional Combined arms warfare .

The ARVN , buttressed by said U.S. support , stopped Process_end the largest and first mechanized PAVN offensive to date during the Easter Offensive of 1972 , resulting in mutually heavy casualties , but failed Earnings_and_losses to recapture all territory , leaving its military situation difficult .

The 1975 Spring Offensive culminated Process_end in the capture of Saigon by the PAVN in April 1975 ; this marked Recording the end of the war , and North and South Vietnam were reunified Cause_to_amalgamate the following year .

The scale of fighting was enormous : by 1970 the ARVN was the world 's fourth largest army , with the PAVN being similar in size at around a million regular soldiers .