Been there, done that (although I recall dragging bags everywhere.) Off to the Herkybird office at 30,000' but first there was breakfast (SOS, of course, and huge greasy omelets) and coffee. With friends, now even more dear decades later.
Young soldiers...the men and women you serve with now are going to be among the most precious friends in later years. "Been there, done that" means shared experiences nobody else can even imagine. Enjoy their friendship now – later, you're going to savor it even more with those who've been there, and done it with you.