An assault course (also called trim trail) is a trail (or course) that combines running and exercising. It was more popular in the 1970s than it is now. It is often used in military training. The prime use is to evaluate progress and weaknesses of the individual or the team involved. The term Assault Course is sometimes replaced by Obstacle Course, which some view as more accurate. Confidence Courses is another term used. There are also specific Urban Obstacle Courses and Night Obstacles Courses. An Obstacle Course Race (OCR) is a civilian sporting and fitness challenge event which combines obstacles and cross country running. Military training Assault courses are used in military training to increase fitness, to demonstrate techniques that can be used for crossing obstacles, and to increase teamwork and self-confidence. Military Assault Courses help develop: Physical Fitness: Strength; Stamina; Mobility. Technique: Such as how to climb over wall and lower oneself safely. Teamwork: Especially on obstacles that can only be crossed as a team such a high walls. Mental Ability: Overcoming challenges and fears by personal courage and determination. Often military assault courses will be standardised, and will have, for example (in the UK), a six-foot and a ten-foot wall, a climbing net, some type of bar to climb over, and a high rope or net that must be crossed (these being or representing the most likely difficult terrain that a soldier will come across). The standardisation means that every course will be to the same quality, though it also means that there will be certain parts that may be familiar if practised. However, they have different purposes. For example, they can be short (less than a minute) with a rifle range on the end (e.g. Junior Leaders, Folkestone), or long (five minutes) as at Thetford. This is partially because of space restraints and training objectives. The short one can be run as an individual course and a warmup for the range. The long Thetford course is more of an exercise in endurance and teamwork. Individual Obstacles can be for general fitness, of for quite specific task such as cargo nets which simulates soldiers climbing down nets from ships into Landing Craft for Beachhead Landings. Climbing through windows is a useful skill when operating in built-up areas, and climbing ladders and over walls proved useful on recent operations. Worldwide common assault course obstacles include barbed wire or nets