Which conflict did the RAF participate in after the Cold War?

The Gulf War is the correct answer as it marks a significant conflict involving the RAF following the Cold War period, which ended in the early 1990s. The Gulf War, specifically from 1990 to 1991, was initiated after Iraq's invasion of Kuwait, leading to a coalition of nations, including the United Kingdom, to respond militarily to liberate Kuwait. The RAF played a vital role in this conflict, employing a range of aircraft for missions such as air superiority, precision bombing, and logistical support.

In contrast, the other conflicts mentioned occurred either before the Cold War or during periods not directly associated with the post-Cold War context. The Vietnam War took place predominantly in the 1960s and 1970s. The Bosnian War, while involving NATO air operations in the 1990s, was later and not as directly linked to post-Cold War military engagements as the Gulf War. The Korean War occurred in the early 1950s, well before the Cold War's conclusion. Thus, the Gulf War distinctly highlights the RAF's involvement in a significant conflict in the post-Cold War era.