The 1923 regs had sky blue cap bands for air force on the dark blue forage caps but not on service dress caps. In WW2 aircrew under training also wore coloured cap bands or as a coloured wedge in the front of f/s cap. Light blue and white cap bands/wedges were worn in different phases of training. It could be that this chap put a piece of helmet flash or training cap band behind the badge unofficially or it could perhaps have been worn at the same time as a blue wedge which is now missing? In the 1950s sky blue cap bands were introduced for colonels and higher ranks fir wear with blue grey service dress.
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