The DIA (Defense Intelligence Agency) is 1 of 16 US military intelligence agencies. According to a leaked document obtained by Judicial Watch, the DIA wrote on August 12, 2012 that:
“there is the possibility of establishing a declared or undeclared Salafist Principality in eastern Syria (Hasaka and Der Zor), and this is exactly what the supporting powers to the opposition want, in order to isolate the Syrian regime …”
This was written before ISIS came on to the world stage.
http://www.judicialwatch.org/wp-content/uploads/2015/05/Pg.-291-Pgs.-287-293-JW-v-DOD-and-State-14-812-DOD-Release-2015-04-10-final-version11.pdf