Soldier
Concept · Stellaris 4.5.2
Soldier in the Stellaris encyclopedia: Soldiers produce Naval Capacity and Defense Armies.
Soldier in the game's words
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Soldiers produce 
Naval Capacity and 
Defense Armies.
Military professionals are needed to train a steady stream of new recruits for army and naval operations.
Entries that mention Soldier
Source: common/game_concepts (concept_soldier, also concept_soldiers) and localisation/english, Stellaris Cygnus v4.5.2 (9776).