In my humble opinion, you just have to be imaginitive when answering these competency based Qs. For the mil folks you don't have to start your answer with 'when i was on ops in..' if you are getting the feedback from the HR bod.
If you were an instructor civvy or mil there are plenty of life examples or even from team sports, even if it was a long time ago.
To be honest I took some real life experiences then with some imaginitive editing came up with in answer to some difficult Qs a plausable and amenable answer.
Usual health warning applies re all advice. Good luck to all, its been 3 years and I am loving it (now that I have finished my sims for another 6 months).