CRG
You used to be able to get into the RAAF and ARA with CP2 colour perception 2. This meant you failed the Ishihara Colour Plate test but could pass the Farnsworth Lantern Test. The Farnsworth test is a series of red, green and white lights that are shone at the applicant and must be identified correctly.
The RAN requires CP1 because of the approach systems on their ships. As the Army now operate their Blackhawks from RAN ships there was a major push to get all the services to CP1. Not sure if they got there but there was often little sympathy from the medical branch for this condition - perhaps because they always had enough applicants who could pass the vision test.
The civilian rules were changed only after an Administrative Appeals Tribunal case found in the favour of the applicant. The defence force were not sympathetic to the ruling.
I wish you all the best - recruiting is usually very helpful in organising a colour vision test.
JB