1991 Desert Scorpion: Cobra Desert Trooper
Desert Scorpion came loaded with weapons including a rifle, a missile-equipped backpack, two digging gloves, and a (pet?) scorpion.
For hand to hand combat, or digging situations, the Desert Scorpion can mount his rifle to his missile-equipped backpack.
NOTE: The accessories above did not come with 1991 Desert Scorpion (but they should have). They came with 2004 Sand Scorpion figure.
I always thought the pet scorpion idea was pretty ridiculous.
I mean, Croc Master taming crocs is one thing, but this desert trooper taming a giant mutated scorpion was another entirely.
This biomechanical scorpion attaches like a backpack or detaches to terrorize Joes from the ground. Its tail and legs are articulated. The front two can carry the extra gun and claw attachments.
The illustration below is from the Collectible Toys & Values (1993) article, seen on Kirk Bozigian's Creator Profile page.