Depending on your audience, you may want to leave Section Officer, Ministry of External Affairs as it is in English because it refers to a specific function in the Indian Governmental system.

However, if you want to explain it better to the Italian audience, you can use the term 'funzionario' or 'ufficiale' for 'officer'. The term 'officer' is often used to describe such positions in government services, and may or may not be, of military background.