Gen. John Hyten, head of U.S. Strategic Command and the presumptive next vice chairman of the Joint Chiefs of Staff, has singled out the fledgling Space Sensor Layer project as a modernization priority in a letter to lawmakers, a move that comes as fissures are showing among Pentagon leaders about the best approach to developing a new low-earth orbit constellation. In a March 25 letter, Hyten wrote to lawmakers in response to a statutory mandate to identify unfunded STRATCOM requirements...