 For example, NFOs only serve aboard multi-crew naval aircraft and as certain multi-crew aircraft are retired from the active inventory, NFOs can become displaced, as happened with the withdrawal of the A-6, EA-6B, F-4, F-14 and S-3 from active service.In addition, as avionics have become more advanced, the need for some multi-crew aircraft using one or more NFOs has been reduced.However, the majority of NFOs (as well as Naval Aviators) from aircraft being retired have historically been afforded the opportunity to transition to another aircraft platform, such as F-4 and F-14 transitions to the F/A-18D and F/A-18F, A-6 transitions to the EA-6B and S-3, S-3 transitions to the P-3/P-8, E-2 and F/A-18F, and EA-6B transitions to the EA-18G.