Answer:
American troops; Vietnamization
Step-by-step explanation:
"Vietnamization" was the name given to a policy of president Richard Nixon, in which he tried to end the American involvement in Vietnam by reducing the number of American troops and trying to get the South Vietnamese to take over more of the fight. The program included training and equipping the South Vietnamese to make them more effective in combat roles. This was a reaction to the extremely negative popular opinion that American citizens had towards the war after certain events, such as the Tet Offensive.