What was the worst day you had in the military, and how did you/do you deal with it?

Mine was 9 July 2006, During the Surge in Iraq... Too too many casualties... After an EFP strike on one of our Patrols that resulted in 1 KIA (The Squad Leader who was on his 4th deployment to OIF) and 2 WIA....

I can still remember arriving at the CSH, and talking to young MPs from his squad, probably all in their first year in the Army... and the one young MP still covered in blood, who had tried to save her Squad Leader. I remember pinning a Purple Heart on a severely wounded gunner from the M1151 before he was EVACd to Landsthuhl. I can still vividly remember all of us saluting at the helicopter as it lifted off for BIAP for the start of that Squad Leader's last ride home.

I am still not sure why this day was was worst than any other, as we took too many casualties... But this day and event was different... Perhaps it was the fact that that SL was so beloved, or voluntarily on his 4th deployment since 2001... or, because he had a wife and 5 kids, or perhaps it was the stunned looked on the squads face, especially the MP covered in blood.

For some reason, I remember that bad day more than many others...