The Sixth Battalion RUR was taking part in “Operation Moonlight Saunter” in December 1963.
Troops included men from Ballyclare and Larne.
They were joined by a support platoon from Lisburn for the exercise in the Antrim Hills.
The exercise included an “assault on cliffs”, a “strike” on land followed by a simulated attack on a “nuclear power station” at Robin’s Hill.
Reveille was at 4.30am. A helicopter was unable to take off due to the wintry weather conditions.
It would have been the first time in Northern Ireland in which a helicopter would have been used by a TA unit on company exercise.
The operation was under the command of Captain DM Fulford-Talbot.