By the sixties, CHERUB campus was beginning to grow. An admin building was constructed adjacent to the old school (now the education building), as well as a new gymnasium for indoor training.

At this time, large areas of the present CHERUB campus were out of bounds due to 1000s of unexploded artillery shells and bullets used by American soldiers training for the invasion of France.

Many CHERUB agents and staff lived, worked and trained in cramped prefabricated Nissen huts built in the mid 1940s. This uncomfortable situation continued until the main building was constructed in the 1970s.

The two runways, aircraft hangar and control tower were built for use by the United States Air Force in the run up to the D-Day invasion, while the firing range was taken over by the US Army Artillery Service.  This airfield was in use for less than six months and by the 1960s these buildings had fallen into disuse.