Well the Navy above all should be able to identify craft shouldn't they? And the Navy has had dealings with "these kinds of things" since the 60s (or even before) so, i would listen to them. PS: No one said flying saucer did they?
Blue book was a ruse...created by the powers that be to make people think there WERE flying saucers...not black projects. Meant for public and Soviet consumption...head hurt yet?
Bluebook compiled the investigations of reports of UFO and explained them or marked them "unknown." Not much propaganda value.