Famously, Dick Marchinko the founder of SEAL Team Six, the hostage rescue and anti-terrorist team, bought the S&W Model 66 for the Team.

The original Team had something like 78 members, all "shooters", no support people.
In their first year in business, they shot up more ammo in practice then the entire US Marine Corps did.
Later, and still, the Teams use the Model 686 for training and for use when "going swimming with the gun".

From the founding of Navy UDT to today, the teams have used many types and brands of revolvers, including the Colt Detective Special and Cobra to the S&W Model 15 and 629.

There's always a flurry of comment whenever the Teams or Special Forces is seen test firing a new firearm.
A few years ago everyone was all a-flutter after Special Forces was seen testing the Desert Eagle .50.

Point is, they're ALWAYS testing guns to see if they have any use, they don't necessarily actually buy many or actually use them.