I can provide a personal example as well.
My niece is a police officer, 24 years of age. She called me after her first call-out in the middle of the night to an abandoned car and she said to me that the woman had died by suicide. She told me the woman's face looked like a Halloween mask and she had to stay with that person for about an hour before help arrived. She went on a few weeks later to have other similar situations. She's 24 years old and I think it's safe to say that's pretty traumatic. The expectation was that she go back to work the next day. Had she broken her leg in the line of duty, it would have been different.
Fortunately, I am head of the Mental Health Commission. Not everybody has such an aunt. I pushed her to get help and she's doing well, but it's an ongoing process because these situations are very real on a daily basis, and I'm sure our police officers have many examples.