I wouldn't wait if I was you, Now is the time to get an answer. Point out to them how dumb you were the second time, by doing weights instead of circuit training and that this time you know that you will pass all the tests.
I mean if you are going to try three times and you still do not know what is required...
No-one wants to hear about how you did not measure out the length of the running track or that you decided to work on bulk instead of all round fitness. Not in today's world of multimedia.
Just in case you are not aware - first contract is for 5 years.
But seriously, if you really want to get in, get the letter sent off now. Explain that you understand that you will have to wait until the confinement is over. Forget the macho look and as soon you can hit the running track.