▁within ▁the ▁Army ▁of ▁Revolution aries , ▁along ▁with ▁smaller ▁fa ctions . ▁ ▁Size , ▁growth ▁and ▁composition ▁▁ 2 0 1 5 ▁ ▁At ▁the ▁time ▁of ▁its ▁found ing ▁in ▁late ▁ 2 0 1 5 , ▁The ▁Econom ist ▁described ▁the ▁S DF ▁as ▁" ess entially ▁a ▁subs idi ary ▁of ▁the ▁Kur d ish ▁Y PG ". ▁ ▁At ▁the ▁end ▁of ▁October ▁ 2 0 1 5 , ▁the ▁al - Sh ait at ▁trib al ▁milit ia , ▁the ▁Des ert ▁Haw ks ▁Brigade ▁joined ▁the ▁S DF ▁to ▁fight ▁I SI L ▁in ▁the ▁southern ▁coun tr ys ide ▁of ▁Has ak ah ▁Governor ate . ▁ ▁On ▁ 1 5 ▁November ▁ 2 0 1 5 , ▁the ▁F SA ▁group ▁Eu phr ates ▁Jar ab ulus ▁Batt al ions ▁announced ▁its ▁acc ession ▁to ▁the ▁Sy rian ▁Democratic ▁Forces . ▁ ▁On ▁ 2 ▁December ▁ 2 0 1 5 , ▁members ▁of ▁the ▁De ir ▁ez - Z or ▁Governor ate - based ▁Arab ▁tribe ▁al - Sh ait at ▁joined ▁the ▁S DF , ▁sending ▁f igh ters ▁to ▁al - Sh add ad ah . ▁▁ 2 0 1 6 ▁▁ ▁With ▁continuous ▁growth ▁in ▁particular ▁due ▁to ▁Arab ▁groups ▁and ▁volunte ers ▁joining , ▁in ▁March ▁ 2 0 1 6 ▁only ▁an ▁estimated ▁ 6 0 % ▁of ▁the ▁men ▁and ▁women ▁in ▁the ▁S DF ▁fighting ▁force ▁were ▁eth nic ▁Kur ds . ▁G row th