Latest roster of Air Force heroes – or, as the service prefers to call them, “Portraits in Courage” – consists of 20 airmen who recently performed heroic feats, mostly in Afghanistan. They all make for inspiring reading, especially if you’re stuck behind a desk. Four of the 20 – 20% — are women. Females make up 19.1% of the Air Force’s enlisted ranks. Funny how that works out.