Reza Shah visiting the troops, 1915s.
Deep inside, in theory and strategically, Reza Shah was pro Axis and heavily Germano-Feel (many of iranian people too). On paper, Iran was neutral; however, the complete hierarchy of Iranian Railroad, Armed Forces and many industries were built and organized by Germans!
In this picture you can observe The Persian Military Uniforms during the reign of Reza Shah were the exact replicas of the German uniforms! The Helmets, the color, and the equipment were all German.
...& Notice the "Heil" salute along with the Imperial Iranian Soldiers.