 Complete the following phrase:  The Manchukuo Imperial Army was the ground component of the Empire of Manchukuos armed forces and consisted of as many as 170,000 to 220,000 troops at its peak in 1945 by some estimates, having formally been established by the Army and Navy Act of 15 April 1932. The force included members of all the major ethnic groups of Manchukuo, which were trained and led by Japanese instructors and advisors. Despite the numerous attempts by the Japanese to improve the combat capability of the Imperial Army and instill a Manchukuoan patriotic spirit among its troops, the majority of its units were regarded as unreliable by Japanese officers. Their main role was to fight Nationalist and Communist insurgents that continued to resist the Japanese occupation of northeastern China, and occasionally the Manchukuo Imperial Army took part in operations against the Chinese National Revolutionary Army and the Soviet Red Army usually in support of the Imperial Japanese Army. Initially its members were former soldiers of Marshal Zhang Xueliangs warlord army who had surrendered to Japan during the 