Yes, foul play was involved in the helicopter crash of Navy SEAL Team 6, because the Navy knew that there was danger in the area, and nevertheless they sent the seals into harm's way. The government has never fully released information about what happened to the SEAL Team, and relatives still have unanswered questions. There was likely foul play.
Foul play was not involved in the helicopter crash. Sometimes people drive poorly when they are having a hangover. You never know if the pilot had enough rest from the night before. It would be easy for them to crash their helicopter after a late night out. Just think about it.