The president always does what his advisors recommend?
No, the president does not have to do what they reccomend, but he can if he wants. A lot of the time he does.
the most important role of the president is to recommend laws to congress as well as approve laws made by congress. The president is also responsible for devicing a system (with the help of advisors) to carry out these laws. To summarize, the president's most important role is to stabilize the country and ensure its sustainability.
After President Kennedy was assassinated, President Johnson continued the same foreign policy of sending advisors to Vietnam. The advisors requested ground troops to the area, but Johnson refused until 1964. Three Vietnamese gunboats opened fire on the USS Maddox, stationed in the Gulf of Tonkin. President Johnson met with advisors to create a plan of retaliation.