Not long.: Tetanus vaccines prevent lockjaw, a disease of horrible muscle spasms that is generally fatal. If you have already been properly vaccinated within the last 10 years, then you are probably protected unless the puncture wound is profoundly contaminated--prompting a need for a booster vaccine in 5 years. The symptoms of tetanus can occur as quickly as 3 days, although the average is 8 days.
army unit - a military unit that is part of an army. naval unit - a military unit that is part of a navy. air unit - a military unit that is part of the airforce. armour, armor - a military unit consisting of armored fighting vehicles. armed service, military service, service - a force that is a branch of the armed forces.
A battalion is a military unit with 300 to 1,200 soldiers that usually consists of two to seven companies and is commanded by either a lieutenant colonel or a colonel. Several battalions form a regiment or brigade. The nomenclature varies by nationality and by branch of arms, for instance, some armies organize their infantry into battalions, but call battalion-sized cavalry, reconnaissance, or tank units a squadron or a regiment instead.