Head, torso, arms, legs: 30th Airtight
Harness: Marvel Hydra Trooper
Helmet: Chap Mei
Spear Gun: 30th Action Diver
Backpack: 25th Duke

In the early 80's, Palitoy released a line of 3.75 inch figures based on their popular Action Man line from the 70s. Although the line included several repainted GI Joe figures and vehicles (like the VAMP, Fang, Mobat, Steeler, Stalker and Snake Eyes to name a few), most of the characters were made from 5 POA figures. These were divided into several sub-teams like SAS (Special Ops) and Z-Force (Infantry).

Sonar Officer and Deep Sea Defender were part of Q-Force, Action Force's Sea Operations team. I plan to make the rest of the team as soon as I figure out good recipes for the others.