Those wishing to become a Commando are advised the only assured route is by joining as a Royal Marine.
As the Royal Marines have their own specialisation (LC: Landing Craft) who are trained small boat coxwains (RYA qualified) and normally employed within the Assault Squadrons, it's difficult to envisage what requirement there is for a Seaman Specialist within 3 Commando Brigade on a regular basis (draft) or in what volume or capacity they may be required.
Nowadays, the "nice to have" courses are few and far between and tend to be confined to those who need the qualification in the course of their duties.
If you're a volunteer for SFSG or SF, then your average matelot would be well advised undergoing a justified AACC as Jack is hardly renowned for fieldcraft skills and would otherwise be at a severe disadvantage.
Buffer Two Zero! Now there is a blast from the past! In between cleaning up layapart stores in Rosyth he would read books about the French foreign Legion! I am so happy he married who he did and now has a life of eternal pain!!:naka: