Question: How advance is the US army?

Loaded march



A loaded march is a relatively fast march over distance carrying a load. It is both a common military exercise and a civilian activity.
A loaded march is known as a forced foot march in the US Army. Less formally, it is a ruck march in the Canadian Armed Forces and the US Army, a tab in British Army slang, a yomp in Royal Marines slang, and stomping in Australian Army slang.
As a civilian exercise, loaded marching comes under the category of 'hiking', although this includes activities not vigorous enough to be compared to loaded marching. Civilian activities analogous to loaded marches are quite popular in New Zealand, where they are organised by "tramping clubs".
In many countries, the ability to complete loaded marches is a core military skill, especially for infantry and special forces.  Loaded marching is particularly important in Britain, where all soldiers must complete annual loaded march tests.
In certain climates, the use of loaded marches is limited, since they would result in high casualty rates through heat exhaustion.
In the Roman Army
According to Vegetius, during the four-month initial training of a Roman legionary, loaded marches were taught before recruits ever handled a weapon; since any formation would be split up by stragglers at the back or soldiers trundling along at differing speeds.[1] Standards varied over time, but normally recruits were first required to complete 20 Roman miles (29.62km or 18.405 modern miles) with 20.5kg in five summer hours,[2] which was known as "the regular step" or "military pace". (The Romans divided daylight time into twelve equal hours. Depending on the exact day of the year and the latitude, the length of a "summer hour" would vary. Five summer hours is therefore not exact, but could indicate a time of approximately six modern hours.) They then progressed to the "faster step" or "full pace"[3] and were required to complete 24 Roman miles (35.544km or 22.086 modern miles) in five summer hours loaded with 20.5 kilograms (45lb). Training also included some forced marches of 20–30 miles, often followed by the construction of basic defences for an overnight position.
In some cases, each member of a Roman unit marched with a sudis, to aid the construction of defences.
In the British Armed Forces
In the British Army, loaded marching is considered a core skill and is tested annually in a 12.9 kilometers (8mi) Annual Fitness Test (formerly known as a Combat Fitness Test) carrying 15–25kg depending on the arm (25kg for infantry, 20kg for artillery, armour/cavalry, and engineers/sappers; 15kg for other arms and services). However, infantry soldiers are additionally expected to complete advanced tests, typically a first day of 20km (12.43 miles) with 30 kilograms (66lb) in three and a half hours, followed by a similar march with 20 kilograms (44lb) the next day. Within each arm, more demanding units exist (such as close support, commandos and parachutists) and have their own internal standards and tests. Special forces also use their own tests.
During the current selection process, Army recruits are usually made to tab 3 kilometers (2mi)  as an introduction. This is because injuries to the legs are common during basic training tabbing.
The British Army slang term tab has its roots in an acronym, being an abbreviation of Tactical Advance to Battle.
Loaded marches have been particularly important in the British Army since the 1982 Falklands War. Many British commanders felt that British success in the war was linked to the British soldiers' ability to march across the difficult Falklands terrain with their kit. British infantry soldiers in Afghanistan conducted four-hour patrols carrying an average of 50 kilograms (110lb) of equipment, going into battle with that weight if they encountered enemy fighters. There is some debate as to whether this makes them better equipped for battle or weighs them down too much.[4]
In the French Foreign Legion
To complete training, legionnaire trainees must complete the parcours du combattant ("Combatant's Course") of 8 kilometers (5mi) loaded with rifle, helmet and 12 kilograms (26lb)  in 40 minutes, and a night march of 25 kilometers (16mi) in three hours with a load of 18 kilograms (40lb). Various marches of much longer distances are also a part of training such as the "Kepi" march of 50km in full combat gear carrying a rifle, helmet and 30kg load and the "Raid march" of 120km in full combat gear carrying a rifle, helmet and 30kg load simulating the navigation to and raiding of different checkpoints in 3 days. Troublemakers are made to place extra rocks in their backpacks for the duration of the marches. Further in the training of a "Caporal" there is a 100km march which must be completed in 24 hours.
In the United States Armed Forces
Loaded marches in the United States Army are known as ruck marches and are part of basic recruit training. In order to gain the Expert Infantryman Badge (a further qualification for existing infantry personnel) candidates must complete a ruck march of 19 kilometers (12mi)  within three hours, carrying a rifle and load. The total load (including the rifle) may be up to 31.75 kilograms (70lb).  The march is individual rather than in a squad, so an individual may achieve a better time than the three-hour requirement.
See also
Rucksack palsy
Yomp