A fox hole is simply a hole dug in the ground to give the fighting infantry some cover and protection. Usually the Marine infantry is on the move but in cases of establishing defensive positions that are to last the foxholes may meld into trenches. And the Marines (or soldiers) may meld into a unified fighting force with a common spirit.
This extraordinary common spirit is called foxhole solidarity and it is what we ,who have experienced this hyper state of relationship, want to experience again. It is what combat veterans hold as the standard (for better or worse) to which we judge all of our relationships.
Foxhole solidarity is a state of brotherhood, foxhole solidarity is a state of mutual grace, and foxhole solidarity is the basis for the Marine promise, "We leave no man behind.." Foxhole solidarity will only grow stronger in the face of more demise. It is what fighting men in the end fight for..