"It is a real change," said Lieutenant Cordan Mackenzie, 27, one of the F18 pilots on board. Her call sign is 'Big Poppa'.

"Most of the time what we are doing, it feels like training, it feels like a game but you come out here and have intel [intelligence] briefings and you fly missions with NATO allies and it really solidifies how real the things that we do in the world are and how important our mission set is: having a presence here in the Adriatic and having the US work with our NATO allies to make sure the world knows we are still a power to be reckoned with."

She, and her fellow aviators, face the possibility of one day being ordered to fight in air-to-air combat against the Russians should tensions escalate significantly.