Noticed there are two tags:
1) cock_rocket (with two images)
and
2) cum_rocket (with one image)

Alias cock_rocket to cum_rocket ?
(seems like same concept to me)

edit: although i suppose eventually cock_rocket tag could be used for a cumming cock being launched.
(the art tagged with cock_rocket doesn't have the cock or person-with-cock in flight ... more like the cock is being a launchpad or catapult)