Brotherhood
Even as they are under attack and badly outnumbered no man is left behind or treated as less than another. They fight right next to one another and show great respect as they continue to fight badly wounded. They love each other as if they are true brothers and would even die to keep their team alive.
Sacrifice
The SEALs give everything for their brothers and country. Three of them give their lives to a cause of restoring peace. Mike Murphy gave his life to get radio connection in order for his brothers to live.
Ethics
The SEALs are forced to decide whether to kill goatherders who may be Taliban or set them free because they have done nothing wrong. They make the correct ethical choice and set them free, but end up in a war because of it. They immediately regret their decision and are punished for being ethical.