The unofficial Baker teams' insignia.
It was an unofficial shoulder patch (designed by soldiers and hand-sewed by Saigon's tailors), and meant to be worn during conventional warfare only.
CCN, CCC e CCS (Command and Control North, Central, South) were the three SOG's zones of operation.
The two Baker teams were the only one purposely trained for operating in all the three sectors.
The survival knife represents the reconnaissance nature of 'fighting behind enemy lines', using stealth, survival and self-reliance as their primary skills, which are also the reason the Baker teams were created for.
The AK refers to the most clandestine operations ran by the two teams, which required the use of Russian weapons and uniforms in disguise.