Veteran

A veteran was a person who was experienced in a particular background, most often referring to one with prior experience in the military and or combat.
As of 2285, Nyota Uhura was a twenty year space veteran, leaving her Old City Station co-worker confused as to why she chose such an undesirable duty station. She explained that she liked the peace and quiet of her assignment. ()
In 2366, Jean-Luc Picard expressed to William T. Riker that if the government of Angosia III survived the night, he would offer them Federation assistance in re-programming its veterans. ()
In 2368, Geordi La Forge praised Kila Marr's ability to input information into 's computer, saying she handled the unit like a veteran. ()
The combined Romulan Tal Shiar/Cardassian Obsidian Order fleet that attempted to make a preemptive strike against the Dominion in 2371 was said to be manned by combat veterans. ()
Kira Nerys and members of the Shakaar resistance cell operated during the Cardassian Occupation of Bajor and participated in many combat actions. ()
Li Nalas was a revered war hero of the Bajoran resistance during the Cardassian Occupation of Bajor. ()
Miles O'Brien as of 2372 had served in 235 combat encounters and had been decorated by Starfleet fifteen times and was considered an expert on starship combat. ()
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 Veteran