The confirmed historical frame
The key art matches that military era, but has no date card and cannot determine a precise point between films, episodes, or other stories.
Avoid false precision
The published copy does not name an exact year, campaign calendar, or episode-to-mission order. The reliable answer is the late-war frame; more precise placement remains unconfirmed.
The late-war label is enough to distinguish the setting from Imperial stories, but not enough to order missions against existing episodes.