When the commander is in, his or her guidon is displayed for everyone to see. When the commander leaves for the day, the guidon is taken down. It is an honor to be the guidon carrier for a unit, known as a guidon bearer or guide. He or she stands in front of the unit alongside of the commander (or the commander's representative), and is the rallying point for troops to fall into formation when the order is given.
Preclude is defined as  to prevent something from happening or to prevent someone from doing something. An example of preclude is when you take someone's keys away so that they cannot drive.
A: A pre-foreclosure is when a property owner has received a notice of default and foreclosure may be described as imminent. A foreclosure is when the bank has taken action to foreclose on the property. In some states this may include judicial action.