WASHINGTON — The Space Development Agency is preparing to launch at least 13 satellites in late June, the agency’s director Derek Tournear said May 26. This will be SDA’s second launch of Tranche 0 satellites for its proliferated low Earth orbit constellation. Tranche 0 is a 28-satellite demonstration constellation. The first 10 spacecraft — eight communications satellites made by York Space and two missile-detection satellites made by SpaceX — launched April 2 on a SpaceX Falcon 9. SDA initially planned to launch all 18 remaining in June but made some late changes to the manifest, Tournear said in an interview…