On October 28, 2016, NOAA's National Marine Fisheries Service (NMFS), Endangered Species Act (ESA) Interagency Cooperation Division, received your request for concurrence that changes to the National Aeronautics and Space Administration's (NASA) Ultra Long Duration Balloon (ULDB) Program as a result of minor modifications and a need to expand the action area are not likely to adversely affect species proposed for listing or listed as threatened or endangered under the ESA, nor adversely affect designated critical habitat.