The NSFK was first established in the early 1930's, then it was replaced by the DLV. Later, in 1937, the DLV was disbanded and the NSFK was again brought back into action. The DLV insignia and the NSFK insignia are completely different. Attached are photos of each one. Only the NSFK used the Icarus or "winged man" symbol of the two.