Rear (military) in the context of "Internal Troops of Ukraine"

A penal military unit, also known as a penal formation, disciplinary unit, or just penal unit (usually named for their formation and size, such as penal battalion for battalions, penal regiment for regiments, penal company for companies, etc.), is a military formation consisting of convicts mobilized for military service. Such formations may consist of military prisoners convicted under military law, civilian prisoners convicted in civilian courts, prisoners of war who have chosen to side with their captors, or a combination of these groups.

Service in penal military units is generally considered a form of punishment, discipline, or penal labour, used in lieu of, or offered as an alternative to, imprisonment or capital punishment. Penal units have historically been used as disposable cannon fodder, treated poorly or with little regard and used in compromising or dangerous situations (commonly suicide missions such as demining or forlorn hope advance parties), as march battalions that maintain replacement personnel as reserves, or kept in the rear for military operations other than war or menial labour relating to the war effort, guarded and overseen by regular military units, military police, or barrier troops to ensure they do not attempt to escape, retreat, or mutiny. However, this is not always the case: some penal units are treated the same as regular units and, depending on military organization, a dedicated penal unit may not exist at all, with convicts instead being placed in a regular unit. Rewards and incentives for convicts to serve in a penal unit vary—often expungement, commutation, stay of execution, or a pardon—though penal units used as punishment typically lack those by nature.

A front line (alternatively front-line or frontline) in military terminology is the position(s) closest to the area of conflict of an armed force's personnel and equipment, usually referring to land forces. When a front (an intentional or unintentional boundary) between opposing sides forms, the front line is the area where each side's forces are engaged in conflict. Leaders have often fought at the front lines either purposefully or due to a collapse in battle formation. While a calculated risk, fighting on the front has in instances reduced communication and heightened morale. The front is in direct contrast to the rear, which is the position furthest from conflict.

All branches of the United States Armed Forces use the related technical terms, Forward Line of Own Troops (FLOT) and Forward Edge of Battle Area (FEBA). These terms are used as battlespace control measures that designate the forward-most friendly maritime or land forces on the battlefield at a given point in time during an armed conflict. FLOT/FEBA may include covering and screening forces. The Forward Line of Enemy Troops (FLET) is the FEBA from the enemy's perspective.

Fire support is a military tactics term used to describe the use of weapons and munitions aimed to support friendly forces by engaging, destroying or suppressing enemy forces, facilities, or materiel in combat. It is often provided through indirect fire (artillery) launched from the rear, though the term may also be used for some direct fire or aerial attacks performed by front line units to support other friendly units.

The United States Department of Defense defines fire support as "fires that directly support land, maritime, amphibious, and special operations forces to engage enemy forces, combat formations, and facilities in pursuit of tactical and operational objectives."

In German military history, Bandenbekämpfung (lit. '"bandit-fighting" or "combating of bandits"; English equivalent of "anti-partisan operations"'), also referred to as Nazi security warfare during World War II, refers to the concept and military doctrine of countering resistance or insurrection in the rear area during wartime with extreme brutality. The doctrine provided a rationale for disregarding the established laws of war and for targeting any number of groups, from armed guerrillas to civilians, as "bandits" or "members of gangs". As applied by the German Empire and later Nazi Germany, it became instrumental in the crimes against humanity committed by the two regimes, including the Herero and Nama genocide and the Holocaust.

Historian Alex J. Kay estimates that around one million civilians died as a result of German anti-partisan warfare—excluding actual partisans—among the 13 to 14 million people murdered by the Nazis during World War II.

Combat readiness is a condition of the armed forces and their constituent units and formations, warships, aircraft, weapon systems or other military technology and equipment to perform during combat military operations, or functions consistent with the purpose for which they are organized or designed, or the managing of resources and personnel training in preparation for combat.

Different armed forces maintain different levels of readiness for the troops to engage in combat, varying from minutes to months; economic considerations are a major factor in explaining the variation.

Shock troops, assault troops, or storm troops are special formations created to lead military attacks. They are often better trained and equipped than other military units and are expected to take heavier casualties even in successful operations.

"Shock troop" is a loose translation of the German word Stoßtrupp (literally "thrust squad" or "push squad"). Assault troopers are typically organized for mobility with the intention that they will penetrate enemy defenses and attack into the enemy's vulnerable rear areas. Any specialized, elite unit formed to fight an engagement via overwhelming assault (usually) would be considered shock troops, as opposed to "special forces" or commando-style units (intended mostly for covert operations). However, both types of units could fight behind enemy lines, by surprise if required.
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