Hi chum, good to see you're so keen. Green lid is entirely possible as a naval officer provided you can give a good enough reason (and demonstrate fitness) to get a place on a highly subscribed course.
A good friend of mine passed the AACC, and then....got streamed Merlin. Needless to say, he wasn't pleased. However sadly eventually he was eventually chopped, and is now extremely happy to be training in NZ for an airline that rhymes with Greasyjet.
This doesn't mean that this will happen to you.
Go for it.
BL