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This is a review of the 1982 JUMP (Jet Mobile Propulsion Unit) as well as the 1983 version which came with a Grand Slam figure. The GI Joe jet pack (technically a rocket belt) was made available again in 1985-1989 as a mail-away and in 1987-1990 as part of the mail-order Starduster figure (just the pack). The figure that came with the rare 1983 JUMP is known as "silver pads" Grand Slam and he is the reason why it's so expensive on the aftermarket.