Post-World War II military leaders were profoundly influenced by their experiences. The prevailing belief was that the United States possessed the strongest military ever, capable of defeating any enemy. Victory over the Nazis and the Japanese Empire fostered confidence in handling future conflicts, particularly against seemingly weaker opponents.
The nature of conflict began to shift from traditional warfare to new forms. Insurgency and guerrilla warfare emerged as primary modes of conflict. President John F. Kennedy recognized that Vietnam represented a different kind of war, leading to the concept of flexible response.
Military leaders, often referred to as "the brass," included high-ranking officials and generals who held significant influence within the military establishment. They often viewed Kennedy as inexperienced and naive regarding military tactics and strategy, exacerbated by their adherence to traditional methods of warfare. This faction within the military believed that direct engagements and overwhelming force were the keys to victory, and they struggled to adapt their mindset to the evolving nature of conflict in Vietnam, which required more nuanced strategies. Kennedy's lack of active military service during World War II contributed to the perception that he was not qualified to lead military decisions, leading to tensions between him and military leaders. The brass's unwillingness to acknowledge the unique aspects of the Vietnam conflict created an environment of mistrust and disagreement over strategies. Despite their military honors, these leaders often resisted innovations that could help navigate the complexities of guerrilla warfare, preferring to operate within the paradigms of conventional military theory.
President Lyndon B. Johnson aligned more closely with traditional military perspectives, supporting the brass in a way that Kennedy had not. He relied heavily on the military establishment to influence policy decisions regarding the Vietnam War. This reliance demonstrated a continuation of established military thought rather than embracing new strategies, reinforcing the brass's traditional views and leading to increased military engagement in Vietnam.
The Gulf of Tonkin incident is noted as one of the most controversial triggers for escalating U.S. involvement in Vietnam. It raises the question of when a conflict officially becomes a war: often occurring when a president chooses to escalate, with Congressional support. The military brass's push for a vigorous response to perceived threats played a pivotal role in the decisions leading up to the escalation of the conflict.
Flexible response is a military strategy developed during the Kennedy administration, primarily in reaction to the challenges posed by the evolving nature of warfare, particularly the increased occurrence of guerrilla warfare and insurgencies such as those seen in Vietnam. This strategy aimed to provide the United States with a range of military options to respond to conflicts, rather than relying solely on massive retaliation with nuclear weapons.
The concept recognizes that not all situations require overwhelming force or direct military engagement and that a variety of tactics—ranging from diplomatic efforts to limited conventional forces and special operations—could be more effective in certain scenarios. Kennedy's introduction of flexible response marks a significant shift away from previous military doctrines, emphasizing adaptability and a more nuanced understanding of international conflicts.