After Burgin gives Oswalt the mortar sight, Oswalt puts it into its case and closes the lid. A second later, the camera cuts to a position slightly further back, and Oswalt is seen putting it into the case again and closing the lid, as if he hadn't already done that.
End of scene, Leckie is on the deck of the hospital ship, a destroyer is in the background number 802, would be USS GREGORY, a Fletcher class destroyer, which although built and commissioned, was still fitting out in Hawaii during Peliliu.