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 prude (Old French prude meaning honourable woman) is a person who is described as (or would describe themselves as) being concerned with decorum or propriety, significantly in excess of normal prevailing standards. They may be perceived as being more uncomfortable than most with sexuality or nudity.