I wanted my comic book 3 pack Cobra Commander to have his battle helmet, so I got a ball jointed Cobra Commander sculpt from J and R Customs before Hasbro stopped them from producing product, cut out a chunk of the neck, and stuck it on the body of the 2004 comic 3 pack Cobra Commander figure.

And for good measure, here's a view of the good Commander with his battle helmet from the first issue of the Marvel
G.I. Joe comic book.