Silver Affair

When part of a five-man unit of special operatives learns that Master Sergeant Avery Franks is being held in a mountain compound in France, the team sets operations in motion to get Franks out.
The bandits, holding Avery, are under some illusion that the United States Military would be willing to make a swape. One American for six of theirs.
That was not how Colonel Reade's team operated. Even if a raid to free Franks were not sanctioned, Darren---the team's captain---the Colonel, Reis Sabette, and Dave Wolf would have tried a rescue mission no matter what the consequences.
The Colonel's team was a splinter group before the forming of the Green Berets and operated outside of usual protocol, engaging in covert operations that others could not undertake.
In this operation, the team annihilates the enemy and finds Franks along with a French citizen who talks of seeing silver ingots placed inside of an underground vault. The team is intrigued, but with the threat of a further enemy encounter looming, they don't have the time to investigate.
Later, a nagging curiosity brings the now-retired team back together to launch one final--- and possible lucrative---mission. But the operation has already been compromised, and nobody knows how or why.