The Ministry of Defence has been issued a Crown Censure after a 20-year-old marine recruit died during exercise.
Ethan Jones drowned while taking part in an exercise of a night beach landing at Tregantle beach, Cornwall, in 2020.
The censure was issued by the Health and Safety Executive (HSE), which investigated the incident.
A Crown Censure is a way in which HSE formally records the decision that a Crown body failed to comply with health and safety laws.
It said as part of the recruits' final training, they "took part in an exercise which included disembarking from a landing craft into the sea and wading to shore".