It’s been 21 years since Sept. 11, 2001 and the terrorist attacks that launched a generation of troops into combat. New numbers from the US military show the staggering cost — 30,177 active duty and military veterans have died by suicide since then.That’s four times as many deaths as those killed in action during the same period, according to the latest Pentagon statistics. In a recent survey by the Brookings Institution, 73% of veterans who fought in Afghanistan say they feel betrayed by the withdrawal from Afghanistan and how the war ended, leading to an uptick in calls to veteran suicide hotlines, according to veteran advocates. Ret.