The correct form is Armia (Армия

I've noticed also some other discrepancies in the Russian 1914 OOB, will try to point these out later.
The most notable error is the using of Vyacheslav's von Pleve photo instead the actual general Pavel Pleve photo
Vyacheslav von Pleve (minister of Internal Affairs, killed in 1904) https://en.wikipedia.org/wiki/Vyacheslav_von_Plehve
Pavel Pleve (general, the commander of 5th Army) https://en.wikipedia.org/wiki/Pavel_Plehve
Also the general Martos surname is the "Martos", not Matros: https://ru.wikipedia.org/wiki/%D0%9C%D0%B0%D1%80%D1%82%D0%BE%D1%81,_%D0%9D%D0%B8%D0%BA%D0%BE%D0%BB%D0%B0%D0%B9_%D0%9D%D0%B8%D0%BA%D0%BE%D0%BB%D0%B0%D0%B5%D0%B2%D0%B8%D1%87
Sorry for the russian wikipedia link, only Italian version of the page is present in other languages.