Knud Alexander Carl Christian Collis Frederik von Clauson Kaas (1894 - 1977)
Knud Clauson Kass is one of the Danish pilots who volunteered for the Finnish Winter War in 1939/40. He was also a veteran of the Finnish Civil War of 1918 and at 45, one of the oldest pilots to fly in the Winter War. Born 3 June 1894 in Stenstrup, Funen, the son of Second Lieutenant Gustav Adolph Frederik Clauson von Kaas and Selina Hviid.
In 1918 Knud Clauson Kaas fought in The Finnish Civil War 1918 as part of the White Finnish Air Force. He had not trained as pilot at the time, and was thus observer. He returned to Denmark after the war. He trained as pilot in the Danish Army Air Corps. He received his wings in 1926 (pilot's certificate 70/26) with the rank of Løjtnant (Lieutenant) at the outbreak of WW2. In 1940, when Finland entered the Winter War with Russia, Clauson Kaas volunteered for the Finnish Air Force – at the age of 45 he was the oldest pilot in the air force. Following basic training he ferried Gloster Gladiators from Sweden to Finland. He was accompanied by Mogens Fensbo, who had been in Finland for about a month at the time.
The two pilots were then transferred to Lentolaivue 28 (Flying Squadron 28) on Morane-Saulniers engaged in the air defences of the South-Western cities. As the Russians advance and the situation becomes desperate the squadron takes part in offensive operations as well. Knud Clauson Kaas leaves Helsinki on 5 April 1940 and returns to Copenhagen on 7 April 1940 – two days before the German occupation.

Image sourced from:
http://kriminalsager.dk/Carl_Mogensen/F ... n_Kaas.jpg....and I'd really like to know how you found that photo in the first place, talk about obscure, took me forever to find it....