Note to the design of the insignia:
I.The ring means sincerity and unity.
II.The wings on both sides mean loyalty of the solider to defend the country.
III.The red number 4 means the 4th wing.
IV.The arrow at the top left corner means combat.
V.The seagull on the top right corner means recuse.
VI.The wrench at the bottom left corner means aircraft maintenance.
VII.The wind sock at the bottom right corner means flight control.