(S (S (BASENP (DT The) (NN offensive)) (VP (VBD was) (VP (VP (VBN begun) (PP (IN with) (BASENP (NNP U.S.) (NN air) (NN support)))) (PP (IN in) (NP (NP (BASENP (DT a) (NN desert) (NN area)) (ADVP (RB north) (PP (IN of) (BASENP (DT the) (NNP Euphrates) (NNP River))))) (PP (IN in) (NP (BASENP (DT the) (NN province)) (PP (IN of) (BASENP (NNP Anbar)))))))))) (PERIOD .))