Which operation was NOT a part of RAF's engagements after the Cold War?

The correct answer revolves around the timeline of RAF engagements. World War I took place from 1914 to 1918, marking a significant historical event in which the Royal Air Force (RAF) did not exist in its current form (the RAF was formed in 1918). Consequently, it is not classified as an operation that occurred after the Cold War, which is generally considered to have ended around 1991.

In contrast, the Kosovo War, Gulf War, and Iraq War occurred after the Cold War, with the Gulf War beginning in 1990, the Kosovo War in 1999, and the Iraq War starting in 2003. These conflicts represent the RAF's involvement in post-Cold War military operations. Therefore, World War I stands out as the operation that is not relevant to the context of the question.