Pomp and Circumstance Marches central "Trio" section. March No. 4 was completed on 7 June 1907, and dedicated "To my friend Dr. G. Robertson Sinclair, Hereford". It was first performed on 24 August 1907, in the Queen's Hall, London, conducted by the composer. The instrumentation is: piccolo (with 3rd flute), 2 flutes, 2 oboes, cor anglais, 2 clarinets in B, bass clarinet in B, 2 bassoons, contrabassoon, 4 horns in F, 3 trumpets in A, 3 trombones, tuba, timpani (3), percussion (side drum, bass drum & cymbals), 2 harps, and strings. The "Trio" was used by Elgar in a song called "The King's Way"
No. 4 Squadron RAAF to train forward air controllers. The Forward Air Control Development Unit (FACDU) of No. 82 Wing, which operated Pilatus PC-9s, was merged into the new unit, along with the Special Tactics Project. This continued the FAC presence at Williamtown that had been maintained by FACDU and No. 4 Flight, which operated Winjeels out of Williamtown from 1970 to 1989. No. 4 Squadron has operated the following aircraft: No. 4 Squadron RAAF No. 4 Squadron is a Royal Australian Air Force squadron composed of the air force special forces Combat Controllers, aircrew who operate the Pilatus PC-9A(F) (Forward Air Control variant)