Strike Then Melt Away and non-Missile Attacks

[Gauche]

Hello, I've been considering a Living Cities army but I can't find clarification on a certain interaction. The Strike Then Melt Away Command Ability only triggers for a unit that has shot, but there seems to be no definition on what that means. Is it only a Missile Attack, or do things that happen in the Shooting Phase but don't roll to hit/aren't Missile Weapons count as well?

[NinthMusketeer]

It would be a unit that has made a shooting attack, as in with a missile weapon. Note, however, that not all missile weapons roll to hit (some are simply marked *** and are described as an ability) so the key here is if the unit has a weapon profile labelled as missile. Is there a specific warscroll you had in mind?