A terrorist is someone who uses violence targeted on a primarily civilian population in order to achieve political goals. Any actions against the military CANNOT be classified as acts of terrorism. Otherwise you're just using the word 'terrorist' to classify anyone you don't like. This takes away all meaning and all validity.
Nusra Front in Syria says it has detained U.S.-trained rebels (Reuters)
from the article: Erdogan to Obama: Israel risks losing its best friend in Middle East