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Although it could not be said that the entire Planetary Defense Army was incompetent, there were indeed formidable units, but those were exceptions. Generally speaking, their combat effectiveness was far inferior to that of the Star Realm Army.
Moreover, on battlefields where the Star Realm Army was needed for support, it meant that the planet was already in serious trouble and the local Planetary Defense Forces had been unable to resolve the issue. In such cases, with their higher status, stronger strength, and the identity of saviors, the Star Realm Army could easily become the more dominant party.
Strictly speaking, there was no hierarchical relationship between the two forces. However, according to some military regulations of the Empire, the Star Realm Army indeed had the right to take command of the local planetary forces "when necessary."