This issue is a variant of G.I. Joe, A Real American Hero (Marvel, 1982 series) #25 [Direct Edition]. There exist further variants.
No known difference between the covers of the First Print and the Second Print. Only listed in the indicia.
Zeck pencils credit confirmed and Beatty inks credit supplied by www.mikezeck.com (15 June 2011).
The S.H.A.R.C. [Submersible High-speed Attack and Reconnaissance Craft] is drawn like the cartoon counterpart's first appearance in the first tv miniseries (1983- M.A.S.S. device) for this issue in its first appearance. Of other note: when this issue was transcribed into an animated commercial ad for tv, the correct toy model was used instead which would be featured in later Joe issues as well as in the toy commercial for both the SHARC and Cobra Water Moccasin vehicle.