On Armed Forces Day, serving military describe how their work keeps colleagues and the public safe.
Campaigners also called for the A3083's speed limit to be lowered from 60mph.
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As part of a competition, they had to build robots them use them to complete missions on a game table.
Royal Navy officers said the Merlin helicopter would allow airspace observation and track threats.
The Merlin Mk2 helicopter left Helston on Saturday and landed in the Mediterranean on Monday.
A new aircraft hangar is being built at RNAS Culdrose as part of a £100m project.
Sailors from RNAS Culdrose and other organisations paraded through the streets of Madron.
The military parade took place in Helston earlier for the first time since 2022.
