There is no easy solution, there rarely is. Unfortunately there is much about the military (and modern life) which is inherently bad for your mental health: career uncertainty, moving, alcohol, shift patterns, stressful work, war! But how useful is a yearly DLE course or a casual chat from the Padre every now and again. The best we can do is educate people as to what mental illness is and looks like. The old platitudes of 'its good to talk' and 'look out for your mates' are all well and good but you do need to know what to look for and what to talk about. As with physical health, prevention is better than cure so encouraging good mental health when you are well is equally important. And emphasising that mental illness is treatable! You may stop flying (and may return to flying) or have to pause/alter your career trajectory but that is better than suffering on your own.