Passage: For three years following his graduation he served the Third Army in Macedonia. When the constitutional order was restored in 1908, the government sent him to Iran to organize dissidence against the Shah whom Persia had installed during the Persian Constitutional Revolution.  After the Countercoup (1909) of 13 April 1909, he was called back and became the commander of the Imperial Guard.

Question: He served in the Imperial Guard and which other military group?
Third Army in Macedonia