What is the phraseology before takeoff for departing IFR military turboprop/turbojet aircraft?

The phraseology "Change to departure" is used before takeoff for departing IFR military turboprop/turbojet aircraft as it indicates that the pilot should switch frequencies to communicate with the departure control after takeoff. This phraseology is specific in its brevity and clarity, ensuring effective communication in the busy terminal environment. It signifies that the aircraft is cleared for takeoff but does not provide additional instructions that would complicate the critical moments leading up to departure.

When communicating with aircraft, especially in military settings, simplicity and precision are essential. "Change to departure" distinctly informs the pilots of their next step after takeoff, which contributes to the safety and efficiency of departures in busy airspace. This choice encapsulates the transition from tower operations to departure control, which is crucial for maintaining organized and safe flight paths in terminal airspace. Therefore, the phraseology used here is perfectly tailored to serve its purpose in operational contexts.