Accelerated Incremental Progression.
Financial reward for getting qualifications that the system needs wrong needed that usually nvolve a 'Q'.
CG. If you had become a QHCI at FS and a CSRO at MALM, then you would have achieved the maximum x2 permitted.
SAR Q got one as did HTI IIRC, there were pretty much no others for Crewmen.
A SAR Boy who got QSAR - CSRO - QHCI all at the same rank, would only get one AIP. They had to be accumulated at different rank levels.
The effect of a succesfull application was a step up the pay scale and hence some of the fiqures being banded around ammount to tens of thousands of GBP of unexpected debt.