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In American football, a nickel defense (also known as a 4–2–5 or 3–3–5) is any defensive alignment that uses five defensive backs, of whom the fifth is known as a nickelback. The original and most common form of the nickel defense features four down linemen and two linebackers .
All-around defense [1] or perimeter defense [2] is a type of defensive fighting position intended to give military units the ability to repel attacks from any direction. [ 3 ] The positioning of the outer defensive fighting positions of a unit, is circular or triangular, [ 4 ] from a bird's-eye view .
The Seattle 4–3 hybrid defense is based on the 4–3 under front used by Monte Kiffin. [4] [5] [n 1] Unlike the standard 4–3 under, in which all the defensive linemen employ one gap techniques, the Seattle variant has a split personality. In its best known form, half the line uses 3-4 two gap principles, while the other half acts like a one ...
Cover 4, or quarters, refers to 4 deep defenders each guarding one-fourth of the deep zone. Cover 4 schemes are almost always used to defend against deep passes. [10] (See also Prevent defense). The most basic Cover 4 scheme involves 3 CBs and 2 safeties. Upon snap, the CBs work for depth, backpedaling into their assigned zone.
A ballistic face mask, also known as facial armor, is a type of personal armor designed to protect the wearer's face from ballistic threats. Ballistic face masks are usually made of Kevlar or other bullet resistant materials and the inside of the mask may be padded for shock absorption, depending on the design.
Examples of reverse slope defense during the American Civil War included Stonewall Jackson's defense of Henry House Hill during the First Battle of Bull Run (also known as Manassas) (1861), where he ordered his soldiers to lie down below the crest of the hill in order to avoid Union artillery, and Winfield Scott Hancock's counter-attack against Jubal Early at the Battle of Williamsburg (1862).
The second significant version of the 5–2 defense is the 5–2 defense that Bud Wilkinson developed while he was a head coach at Oklahoma. The latter defense, also called the 5–2 Oklahoma, is supposed to have arisen from Bud's exposure to Earle Neale's 5–2 defense in a College All-Star game after the Philadelphia Eagles' first ...
Defence in depth (also known as deep defence or elastic defence) is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.