Head - Bazooka v3
Arms, waist, legs - Falcon
Torso - Skidmark

Rifle - Marauder Inc.
Grenade launcher - Marauder Inc.
Backpack - Repeater

The Sea Devils are my first attempt at a full subteam for GI Joe. It came about when I did a new custom of the Devil's Due version of Shipwreck. I mixed a nice blue colour for his sweater and hat (a mix of basic blue and intermediate blue), but I made way too much of it. It's such a pleasant colour that I decided to build a whole team around it, and the natural theme (both based on the colour and that Shipwreck would be a member) was water. So I came up with the Sea Devils, a Joe team that specializes in amphibious, littoral and riverine operations. Unlike existing subteams, I wanted to do a significant proportion of new characters to go along with the existing Joes who fit in with the idea, and use a relatively consistent colour scheme involving the Shipwreck blue, intermediate blue, and light and medium gray.

Leatherneck is a Marine, and Marines are obvious choices for the Sea Devils. I used a 90s Bazooka head, since the moustache works so well as Leatherneck, and a Falcon lower half since that's what the 90s version of Leatherneck used anyway.