The second F-15EX is now set for months of operational testing with the squadron before it is more widely fielded into military service. Operational testing involves placing an aircraft in a "combat relevant" environment to determine whether it performs as expected. The first F-15EX, which touched down at the base March 11, is assigned to the 40th Flight Test Squadron, part of the Eglin-headquartered 96th Test Wing, the installation's host unit. F-15EX "001" was unveiled at an April 7 ceremony at the base, during which the new fighter jets were christened with the name "Eagle II." The 40th Flight Test Squadron is conducting developmental testing of the F-15EX. Developmental testing assesses an aircraft's capabilities and limitations with the aim of improving its performance.