When I was going through Marine officer training, one of the things we had to do was learn how to dig foxholes. For those of you not familiar with military traditions, a foxhole is a pit that combat troops dig to give them shelter from enemy attacks. My training course occurred in northern Virginia, during the summer, when it was not only hot, but humid. So digging anything was not fun. Being young and lazy at the time, I proceeded to dig a foxhole that was barely big enough to hide me from the enemy.