One of the most memorable images from June, 2019 was that taken by a Dallas Morning News Photographer. It shows a man in a black armored, pocketed vest with a black cap, face covering, green clothes, black boots and a large black gun about to enter the Earle Cabell federal courthouse in Dallas, Texas.  
Another was of sobbing survivors of a mass shooting at the Virginia Beach municipal center hugging each other on a bright, sunny day.
Only the shooter was killed in the Dallas event. 12 people died at the scene of the Virginia Beach event.
In a recent column for Stratfor Worldview, VP of Tactical Analysis, Scott Stewart, noted that while incidents of workplace violence and mass public attacks are a persistent concern, taking security measures ahead of time is a critical step toward avoiding attacks. 
He spoke with Chief Security Officer, Fred Burton.