Kain returned on 14 April to his squadron, which was now based with the rest of No. 67 Wing at Reims and tasked with the protection of the AASF headquarters. Tensions were high as a result of the German invasions of Norway and Denmark, and the "Luftwaffe" had increased its presence along the French border with Germany. However, the squadron was shortly back at Rouvres when the expected fighting in France did not occur. Kain was initially stood down from flight operations so did not undertake his first patrol until 21 April.