sentences:  From Tinian the air echelon flew combat patrol missions under the control of Air Defense Command, Saipan, from 28 March to 28 April 1945.The air echelon joined the ground echelon at Iwo Jima in May 1945.From Iwo Jima, the 506th's squadrons attacked airfields, antiaircraft emplacements, shipping, barracks, radio and radar stations, railway cars, and other targets in the Bonin Islands and Japan.