the endurance from five to twelve hours. The last version had a 410 kW (550 hp) engine instead of 321 kW (430 hp) and produced until 1934, a total of 456, but it was outdated and too slow for the standards of the mid-1930s. Although this was only an army observation aircraft, it still had a quite powerful engine and performance. In 1933, there were 40 squadrons, of seven machines each, related to the Italian Army, with 238 Ro.1s as the main aircraft force. It was the most numerous Italian aircraft in the Second Italo-Abyssinian War. Norway The Norwegian Army Air Service bought its first five C.VEs in 1926. The initial purchase agreement with Fokker included license production rights, and in the period 1929–1931, 15 C.VEs were manufactured at the NoAAS' aircraft factory at Kjeller. After the production of C.VEs ended, a further 28 C.VDs followed between 1932 and 1939. In total, the NoAAS operated 48 Fokker C.Vs, 43 of which were license built in Norway. When the Germans invaded Norway on 9 April 1940, 42 Fokker C.Vs were still in Norwegian service. The C.Vs were based on several air bases in different parts of the country and mostly saw service as reconnaissance aircraft and light bombers. Although the planes were outdated, they still saw extensive and successful service in the bomber role during the April–June 1940 Norwegian Campaign, supporting Norwegian ground troops fighting on the Narvik front. Netherlands The type was used by the Luchtvaartafdeeling (pre war airforce), MLD (marine luchtvaartdienst) and KNIL-ML. For the Luchtvaartafdeling 67 examples were produced in several batches between 1926 and 1934. 28 were still operational at the time of the German attack on the Netherlands on 10 May 1940. They were used successfully on reconnaissance and bombing missions using "nap of the earth" (HuBoBe)(short for huisje-boompje-beestje, literally translated into house-tree-animal, referring to the low altitude at which they flew) flying techniques. Nearly two dozen aircraft were used as trainers and hacks, or in storage and repair Sweden In 1927, the Swedish Air Force purchased two C.VDs (J 3) and two C.VE (S 6) to serve as models for the eventual license manufacturing of the aircraft by CVM at Malmen. The four aircraft were flown to Sweden in 1928. They proved suitable and an agreement for licence production was made and a further four C.V-E and six C.V-D were purchased, the latter designated J