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{{Short description|Units, personnel, and resources not initially committed to battle and available to a commander}}
#REDIRECT [[Military reserve force]]
{{distinguish|military reserve force|Military base{{!}}military reservation}}
{{more citations needed|date=March 2023}}

A '''military reserve''', '''active reserve''', '''reserve formation''', or simply '''reserve''', is a group of military personnel or units that is initially not committed to a battle by its commander, so that it remains available to address unforeseen situations or exploit sudden opportunities.<ref>{{cite encyclopedia|title=reserve|encyclopedia=DOD Dictionary of Military and Associated Terms|date=November 2021}}</ref> Reserves may be held back to defend against attack from other enemy forces, to be committed to the existing battle if the enemy exposes a vulnerability, or to serve as relief for troops already fighting. As reserves (especially in the defence) represent a "hedge against uncertainty", the size of the reserve depends on the level of uncertainty a commander has about the enemy's intentions.<ref name="fm 3-0 p6-39">{{cite book|title=FM 3-0: Operations|year=2022|publisher=[[Department of the Army]]|page=6-39}}</ref> Some of the different categories of military reserves are: '''tactical reserve''', '''operational reserve''', and '''strategic reserve'''.

A military reserve is different from a [[military reserve force]], which is a military organization composed of military personnel ([[reservist]]s) who maintain their military skills and readiness in a long-term part-time commitment to support their country if needed. Military reserve refers to specific trained pre-organized forces operating on an on-call basis from the main military force.<ref>{{cite book |title=A Dictionary of Aviation |first=David W. |last=Wragg |isbn=9780850451634 |edition=first |publisher=Osprey |year=1973 |page=223}}</ref>

==Reserves at various levels==
Reserves are kept and employed at all levels, from a platoon held back from a company level engagement, to whole army [[corps]] consisting of armoured and mechanised [[division (military)|divisions]] which are held in reserve with the purpose of exploiting a breakthrough or containing an enemy advance.<ref>{{cite book|title=Jääkärijoukkueen ja -ryhmän käsikirja 2018|publisher=[[Finnish Army]]|year=2017|page=115}}</ref><ref>{{cite book|title=FM 100-2-1: The Soviet Army: Operations and Tactics|year=1984|publisher=[[Department of the Army]]|pages=4-2, 4-5, 4-7}}</ref> Typically what is a reserve for one [[headquarters]] is not the reserve for a higher headquarters (though depending on the setup they may be). So if one of a battalion's companies is held in reserve during a battle, the company is considered to be a reserve for the battalion but not for the brigade or the division, since it is committed to action in its parent battalion sector.

==Employment==
Deciding where, how and especially when to employ reserves is a key command decision.<ref name="fm 3-0 p6-39" /> In the event of reserves being sent forward to exploit a breakthrough, some are typically held back to deal with a potential [[counterattack]].<ref>{{cite book|title=FM 100-2-1: The Soviet Army: Operations and Tactics|year=1984|publisher=[[Department of the Army]]|page=2-11}}</ref> Alternatively, [[US Army]] doctrine states that a commander should reform another reserve after committing his existing reserve.<ref name="fm 3-0 p6-39" /> Reserves can also be employed to relieve troops in action, allowing those units to rest and regroup away from the front line.

==Notable reserve units==
* [[Reserve Army (United Kingdom)|British Reserve Army]] – A [[army|field army]] of the [[British Expeditionary Force (World War I)|British Expeditionary Force]] during the First World War. The intended purpose of the army was to carry out the breakthrough phase of the Somme offensive once General Sir [[Henry S. Rawlinson|Henry Rawlinson's]] [[Fourth Army (United Kingdom)|Fourth Army]] had captured the German front-line trenches.{{cn|date=July 2023}}
* [[Reserve of the Supreme High Command]] – The principal reserve of the Soviet [[Red Army]] during [[World War II]]. Now part of the [[Russian Armed Forces]].{{cn|date=July 2023}}

==See also==
* [[National Guard (disambiguation)|National guard]]

==References==
{{Reflist}}

[[Category:Military doctrines|Reserve]]
[[Category:Attrition warfare]]

Latest revision as of 16:00, 18 July 2023

A military reserve, active reserve, reserve formation, or simply reserve, is a group of military personnel or units that is initially not committed to a battle by its commander, so that it remains available to address unforeseen situations or exploit sudden opportunities.[1] Reserves may be held back to defend against attack from other enemy forces, to be committed to the existing battle if the enemy exposes a vulnerability, or to serve as relief for troops already fighting. As reserves (especially in the defence) represent a "hedge against uncertainty", the size of the reserve depends on the level of uncertainty a commander has about the enemy's intentions.[2] Some of the different categories of military reserves are: tactical reserve, operational reserve, and strategic reserve.

A military reserve is different from a military reserve force, which is a military organization composed of military personnel (reservists) who maintain their military skills and readiness in a long-term part-time commitment to support their country if needed. Military reserve refers to specific trained pre-organized forces operating on an on-call basis from the main military force.[3]

Reserves at various levels

[edit]

Reserves are kept and employed at all levels, from a platoon held back from a company level engagement, to whole army corps consisting of armoured and mechanised divisions which are held in reserve with the purpose of exploiting a breakthrough or containing an enemy advance.[4][5] Typically what is a reserve for one headquarters is not the reserve for a higher headquarters (though depending on the setup they may be). So if one of a battalion's companies is held in reserve during a battle, the company is considered to be a reserve for the battalion but not for the brigade or the division, since it is committed to action in its parent battalion sector.

Employment

[edit]

Deciding where, how and especially when to employ reserves is a key command decision.[2] In the event of reserves being sent forward to exploit a breakthrough, some are typically held back to deal with a potential counterattack.[6] Alternatively, US Army doctrine states that a commander should reform another reserve after committing his existing reserve.[2] Reserves can also be employed to relieve troops in action, allowing those units to rest and regroup away from the front line.

Notable reserve units

[edit]

See also

[edit]

References

[edit]
  1. ^ "reserve". DOD Dictionary of Military and Associated Terms. November 2021.
  2. ^ a b c FM 3-0: Operations. Department of the Army. 2022. p. 6-39.
  3. ^ Wragg, David W. (1973). A Dictionary of Aviation (first ed.). Osprey. p. 223. ISBN 9780850451634.
  4. ^ Jääkärijoukkueen ja -ryhmän käsikirja 2018. Finnish Army. 2017. p. 115.
  5. ^ FM 100-2-1: The Soviet Army: Operations and Tactics. Department of the Army. 1984. pp. 4–2, 4–5, 4–7.
  6. ^ FM 100-2-1: The Soviet Army: Operations and Tactics. Department of the Army. 1984. p. 2-11.