From a New York Times guest essay by Mark Kelly and Tammy Duckworth headlined “We’ve Been on the Frontlines. We Know What Ukraine Needs.”:

Both of us have been the targets of enemy fire. It nearly cost one of us her life. We know a truth every combat veteran learns: For all the planning and consideration that goes into a war, much of it gets thrown out the window the moment the shooting starts. You often learn more about your enemies in the first 24 hours of a conflict than you do from years of studying them.