Angel M. Otero , the chief of the space operations division at NASA 's Glenn Research Center in Cleveland , acknowledged that computer simulations or wind tunnel tests could go only so far .
Cleveland /location/location/contains Glenn Research Center
NNP NNP NNP , DT NN IN DT NN NNS NN IN NNP POS NNP NNP NNP IN NNP , VBD IN NN NNS CC NN NN NNS MD VB RB RB RB .