NATIONAL HARBOR, Md.--The 2020s will be a challenging time period for the Defense Department as it grapples with how to pay for numerous high-priority weapons endeavors with bills that arrive at roughly the same time. "When we get to the (2020s), a lot of things have to be paid for at the same time," Under Secretary of Defense for Acquisition, Technology and Logistics (AT&L) Frank Kendall told reporters Wednesday following a presentation here at the 2014 Air and Space Conference…
