[Milmed]

While sorting through my odds, I found this interesting little enamelled pin, so started a hunt on google with the information at hand namely (CVV and a Latin scroll 'Caelum Tuemur' [We Watch over the Sky])

Found that it was a Dutch Air Force unit Centrale Vluchtinlichtingenen
Verbindingsgroep (Central Flight Information and Liaison Group), formed around 1959.

The 2nd Air Force Connection Group (2 LVG) is charged with the management and operation of the national connection systems for information
exchange between staffs, parts, inter service, national and NATO units. The three arrows in the insignia symbolize the armed forces
over which the task of 2 LVG extends. The silver lightning bolt symbolizes the liaison task of 2 LVG.