Friendship is one of the most important things in the world. What would our lives be without the people who make us laugh so hard we can barely breathe, console us when we're inconsolable, and do everything they can to support us?
Life can be tough, and sometimes difficult experiences make friendships ever tighter - whether it's the result of you and a friend coming out of a relationship at the same time, or witnessing something truly traumatizing together.
And if that bond is tight enough, you'll probably be in each other's lives until the day you die.
That's exactly how it was for Vietnam veterans Marine Master Sgt. William Cox and Marine First Sgt. James 'Hollie' Hollingsworth. They met all the way back in 1968 during the Vietnam War.
The veterans both served in the VMO-2 Marine helicopter squadron. Hollingsworth served as a mechanic and door gunner and Cox served as an ordnance chief and a door gunner.
The two men met under particularly frightening circumstances; they had entered into a bunker in an attempt to escape the rockets and mortar, and it was this very meeting that ultimately bonded them for life.