Is "wingman" strictly a military term? Does it have to be a potential combat situation for a pilot flying on another's wing to be called a wingman. If two aircraft are being flown in formation to a destination simply for the purpose of transportation, would the term wingman be used?  Is wingman used in civilian aviation?
While the combat military role of a wingman is established, the term is entirely appropriate and is used for non-combat formation flying as well.  And unless there is a better term, it would be logical to extend the use to civilian formations also.