The J.U.M.P., or Jet Mobile Propulsion Unit, is like many other weapons used by the Joes in that it is highly experimental. It essentially consists of a strap-on, back-mounted rocket pack that gives the Joe wearing it exceptional air-based mobility, making him as effective as some aircraft in combat.

Mounted on the J.U.M.P. as a sort of sidearm is a laser rifle similar to that which Flash uses as part of his field weaponry, one that can be used per a +5 weapon with each deadly burst, and can fire about ten shots before it needs to be recharged.

The J.U.M.P., which has a top speed of about 150 miles per hour (intensity 6 flight), can fly for up to two hours without needing a refuel. The controls for the pack, along with an infrared sight (for a +1 to hit) are located on top of the laser rifle - allowing its pilot to effectively fly and shoot at the same time.

The J.U.M.P.'s operation is enhanced by these features:

Control Station: this computer has a specialized hookup with the J.U.M.P. that allows it to run diagnostic tests on the unit, as well as properly monitor the rocket pack while it is in use. It can track the J.U.M.P. with intensity 5 ability, meaning that this feature works as long as the pack is within 100 miles.

Gear Cases: the J.U.M.P. has, spread about its other features, various cases filled with useful gear. It has a fully stocked first aid kit, tool kit, and a few spare parts should the rocket pack get damaged slightly while being used in the field.

Launch Pad: this V.T.O.L platform, especially designed for use with the J.U.M.P., is built from a magnesium frame (lightweight for transport purposes) but topped with a titanium landing pad, which can easily resist the flames and thrust generated by the J.U.M.P.'s taking off and landing.

Refueling Stations: the J.U.M.P. is usually mounted on a special rack adjacent to its launch pad, one that hooks into the fuel pump and power pack of the rocket pack and laser rifle, respectively. Assuming a ready supply of fuel and electricity is available, the J.U.M.P. can be used in the field long-term.