Commando: On the Front LineIn Commando: On The Front Line, director Chris Terrill embarks on a courageous 12-month journey to Afghanistan alongside Britain's most elite front line troops - the Royal Marine Commandos.

A division of the Royal Navy, the Royal Marine Commando directs the most physically and mentally challenging training regime of any military contingent in the United Kingdom, and only the cream of the crop gets through.

This eight-episode series provides fascinating insight into the experiences of the 50 new recruits of 924 Troop - following the Bootnecks through their hardcore eight-month training period, right up to their arrival on the front line and first moments wearing the illustrious green berets in combat.

The transformation of the young men is incredible, as is the footage obtained by Terrill, who got involved side-by-side with the boys at every step of the way.

Watch the full documentary now (playlist)