About 2700 active working dogs in the military in the USA, Air Force buys about 450 dogs a year, budgets $5.3 million to buy dogs each year, operating budget of about $8 million, 92 dogs died while deployed 2001-2013 (32% gunshot wounds, 26% explosion blasts, 10% heat stress), one quarter of military dogs with behavioural problems engage in repetitive behaviour