BARS (Russia)
BARS or Combat Army Reserve of the Country ()  or simply the Combat Army Reserve is a Russian military reserve force implemented in 2015. History

Formation
The Combat Army Reserves was created by the Ministry of Defence in 2015 as an analogous organization to the British Territorial Army or the United States Army Reserve with members being paid a salary per a three year or a one and a half year contract, and participating in at least a month per year of part-time training, with the prospect of being called to active duty in the event of war. In 2019 a study by the RAND Corporation found that there were only 4,000 to 5,000 reservists in the whole of Russia. Russian invasion of Ukraine

In 2021, during the build-up towards the Russian Invasion of Ukraine, the BARS were the subject of a massive recruitment campaign titled "BARS-21" which Russian Defense Minister Sergey Shoigu stated in several speeches hoped would bolster the force to 80,000 to 100,000 reservists. Eligible BARS reservists in the days before the invasion included soldiers younger than 42, junior officers younger than 47, colonels younger than 57, and other senior officials younger than 52. When the war did break out, 20 BARS units consisting of an estimated 10,000 reservists, were sent to Ukraine to take part in the initial invasion. BARS reservists were, on paper, paid a much higher salary than Russian conscripts and were supposed receive a hefty pension for their service, however, upon the completion of their service, most reservists saw little to none of the promised money or bonuses. The reservists where outfitted in decommissioned surplus and many were given rusted AK-47s. Most BARS soldiers are older veterans of the War in the Donbas, with many being members of the Union of Donbass Volunteers, and are from smaller rural settlements. BARS units and Russian PMCs often overlap, with several BARS units being directly affiliated or even run by a PMC, leaving the units in a legal grey-area. On 24 July 2023, Vladimir Putin signed a law increasing the maximum age for all BARS members by five years. Increasing the maximum age of privates, sergeants, and ensigns from 35 to 40, officers of middle ranks from 45 to 50, and high-ranking officers from 50 to 55. Units
BARS-1: Kuban Cossacks
BARS-2: Yakuts, Saw combat around Kharkiv in 2022. Absorbed the "Bootur-1" volunteer unit in May 2023. Bootur-1's commander, Alexander Kolesov, would become deputy commander and receive the Hero of Russia for his role the 2023 Belgorod Oblast incursions. BARS-3:
BARS-4: Veterans that returned to Russia reported a lack of pay, denial of medical treatment, and a deletion of military records. BARS-5:
BARS-6: 'Forstadt', Orenburg Cossacks. BARS-7:
BARS-8:
BARS-9: 'Orel', Commander Rustam Ziganshin died in September 2021. Affiliated with the Union of Donbass Volunteers. BARS-10: Soldier from BARS-10 joined Wagner 
BARS-11:
BARS-12:
BARS-13: 'Russian Legion' Commander Sergei Fomchenkov. Affiliated with the Union of Donbass Volunteers, originally named 'Rurik'. BARS-14 "Sarmat":
BARS-16: 'Kuban', Kuban Cossacks
BARS-18:
BARS-19:
BARS-20: 'Thunder' Affiliated with the Union of Donbass Volunteers. BARS-21:
BARS-23 "Eagle" or "Orel":
BARS-29: "Nevske" Created October 2022 from an artillery detachment reformed into a BARS unit due lack of manpower. BARS-32 "Pavel Sudoplatov": The Russia’s Ministry of Defense subordinated the “P. Sudoplatov” volunteer battalion formed on the occupied territory of Zaporizhzhia Oblast to the 32nd BARS detachment. BARS-33 "Vasyl Margelov":

References

Army units and formations of Russia
Reserve forces