Military operation in barracks -- a GI recalled name (8)
I believe the answer is:
campaign
'military operation' is the definition.
(I've seen this before)
'barracks a gi recalled name' is the wordplay.
'barracks' becomes 'camp' (I can't explain this - if you can you should believe this answer much more).
'recalled' is a reversal indicator (to recall can mean to bring something back).
'name' becomes 'n' (common abbreviation e.g. on forms).
'gi' backwards is 'ig'.
'camp'+'a'+'ig'+'n'='CAMPAIGN'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for campaign that I've seen before include "lobby" , "A series of planned activities, as for advertising" , "Electioneer" , "Series of activities to attain a goal" , "battle" .)