Betsy McAllister, Hampton City Schools science teacher specialist, prepares for an oyster planting event at Joint Base Langley-Eustis, Va., June 8, 2017. As generations of oysters settle on top of each other and grow, they form reefs that provide structured habitat for many species of fish and crabs. (U.S. Air Force photo/Airman 1st Class Anthony Nin Leclerec)