|To apply for the most of the SOF units in the world that I know, you don't need to have much military experience, or what's case with many units, you can even be a civilian when applying. If you are 18 and meet other requirements you are free to try out. For example let's take the SEALS. If someone starts through BUD/S 18 years old, when he is 19 or 20 years he could be over with BUD/S and additional schools such as airborne school, and he would be accepted into the unit. After that how much time and further indoctrination is needed to be sent to missions. For example let's take the Scott Helvenston(RIP) who finished the BUD/S at 17 years of age and officialy became a SEAL. He couldn't be sent to missions at 17 or 18 years old ? Is there something like minimum age when you can be sent to missions ? I know it's another story with regular infantry, where 18 or 19 year olds are regularly sent to combat, but what about SOF units?