You can see some writing on the fuselage side just under the cockpit, it says: US ARMY RA-20A
On the same day that the US Army ordered the A-20 high-altitude light bomber, it also ordered the A-20A, which was a low- and medium-altitude version of the Douglas attack bomber. A May 20, 1939 contract approved on June 30 called for 123 A-20As. The initial order for 123 A-20A aircraft was later increased by 20, these being fitted with the more powerful Wright R-2600-11 engines, although these were still designated A-20A. They were added to the order in exchange for the A-17As that Douglas resold to Britain. The Army liked the A-20A because of its excellent performance and because it had no adverse handling characteristics. Early aircraft were delivered in natural metal finish, with US insignia being carried only on the upper and lower wings. In late 1942, the surviving A-20As were redesignated RA-20A, the R prefix meaning that they were restricted from combat use...
