Officer Candidate Sarah Edwards, Colo., shoots an azimuth during night land navigation at Fort Meade, , July 19, 2012. Officer candidates must pass day and night land navigation courses at part of Officer Candidate School Phase 1. Military compasses use tritium luminosity to provide readability in total darkness. Night Land Navigation Course tests officer candidates 120719-A-QE403-014

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Photo credit: © PJF Military Collection / Alamy / Afripics
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