(Askeri) ÜSTSUBAYLIK: Yüzbaşıdan yukarı Tuğgeneralden aşağı rütbede bulunan subaylık derecesi. Yani albay, yarbay ve binbaşılık rütbeleri. Buna "field officer" da denir
Definition of field grade in English English dictionary
Each of the commissions which rank a (para)military officer below the (highest) class of general officers, but above other commissioned officers and NCOs
In various armies major is the lowest field grade, full colonel the highest field grade.