Much of what occurs in the police and military world revolves around observation. Seldom is any mission undertaken without there having been pre-deployment recon or, unlike in the movies and television, significant pre-planning. While certain scenarios may require you to grab and go, it’s generally necessary to gather as much information as possible prior to taking any significant action. Rushing in is foolish and should only be done when there is absolutely no other choice.
Often information is gathered at a distance, and occasionally on the move. In an urban environment it is not uncommon to be in a moving vehicle as you gather information. Holding a set of binoculars steady is problematic at best while in a car. As a police marksman, you seldom are afforded the ability to have a tripod, and observing moving targets can be difficult as well.