Here are the answers to your questions:
Question 1: President Johnson asked for more military power in Vietnam when the ___ ___ was fired upon by N. Vietnamese ships.
Answer: A - USS Maddox
Question 2: Following the Gulf of Tonkin Resolution, US troop strength ___ dramatically.
Answer: A - increased
Question 3: Constitutionally, who in the Federal government has the power to issue a declaration of war?
Answer: A - Congress