In current Greek military parlance, the related ταγματάρχης means major (literally "battalion commander").
Another example is "Lieutenant Major Goose" in the television series Hey Arnold!, in the episode entitled New Teacher.
The difference here was that the ypotagmatarchis was a full deputy to the commandant, not restricted to matters of supply and pay, as the aide major was.
In July 1829, the then-Governor of the Hellenic State, Ioannis Kapodistrias, promoted the Deputy Chief of Staff of the Morea Expedition, Colonel Camille Alphonse Trézel to General and Commander of the regular army.
[1] Composed at that time of 2,688 men, General Trézel organized it "à la française",[2] both for its administration and for its jurisdiction, for the training and for the advancement of the soldiers, and even for its uniforms which were the same than those of the French.