I know a few guys in Special Forces (2 Seals and one Green Beret), they are also pretty quiet, but they all have indicated in one way or another that most individuals have discretion to select, procure, and use the tools they deem appropriate for the job(s) at hand.Perhaps they are all feeding me a line of BS to kill the topic, but I have heard it in separate exclusive conversations, and one of these guys has never even met the other two.
This FTW. Being in their MOS they are trusted to use whatever they deem necessary for the task at hand. For example, instead of the standard issue M4, they can use an HK416, M14, Mk48 or HK36 among others. Hell even an old M60E3 if they wanted.