sentences:  By this juncture, the government of South Vietnam was collapsing, leaving tons of American-supplied equipment intact for the communist forces.Operation Frequent Wind was launched to evacuate Americans, at-risk Vietnamese and third country nationals, lest they be left behind and fall into communist hands.For the next few days, "Vega" replenished United States and South Vietnamese Navy ships, delivered passengers and mail, and transferred refugee supplies to vessels loaded with fleeing South Vietnamese.