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- 1st Mixed Cluster
- 1st Moore Protectorate Militia
- 1st NAIS Cadet Cadre
- 1st NAIS Cadre
- 1st NAIS Training Cadre
- 1st NAMA
- 1st Najha Militia
- 1st New Avalon Dragoons
- 1st New Avalon Military Academy Training Battalion
- 1st New Canton Protectorate Militia
- 1st New Colony Lancers
- 1st New Earth Protectorate Militia Division
- 1st New Glasgow Aerospace Squadron
- 1st New Hessen Irregulars
- 1st New Ivaarsen Chasseurs
- 1st New Oslo Armored Division
- 1st New Samarkand Regulars
- 1st Night Stalkers
- 1st Nova Cat Carabinieri (Clan Nova Cat)
- 1st Nova Cat Guards (Clan Nova Cat)
- 1st Nova Cat Provisionals (Clan Protectorate)
- 1st Oberon Guards
- 1st Odessa Regulars
- 1st Omega Regiment
- 1st Orestes Lancers
- 1st Oriente Hussars
- 1st Oriente Provincial Squadron
- 1st Orloff Grenadiers
- 1st Periphery Guard
- 1st Pesht Regulars
- 1st Phecda Protectorate Militia
- 1st Pitcairn Legion
- 1st Pleione Protectorate Militia
- 1st Proserpina Hussars
- 1st Protectorate Guardians
- 1st Provisional Lyran Water Navy
- 1st Qandahar Aerospace
- 1st Quentin Protectorate Militia
- 1st Ramora Guards
- 1st Ramsau Irregulars
- 1st Rangers (Clan Hell's Horses)
- 1st Rasalhague Bears (Clan Ghost Bear)
- 1st Rasalhague Bears (Rasalhague Dominion)
- 1st Rasalhague Hussars
- 1st Rasalhague Regulars
- 1st Raven Chasseurs (Clan Snow Raven)
- 1st Raven Phalanx (Clan Snow Raven)
- 1st Raven Regulars (Clan Snow Raven)
- 1st Raventhir Cuirassiers
- 1st Redfield Regulars
- 1st Regiment
- 1st Regiment (12th Star Guards)
- 1st Regimental Combat Team
- 1st Regulan Hussars
- 1st Republican
- 1st Republican Guards
- 1st Rim Commonality Guard
- 1st Rim Commonality Guards
- 1st Rio Protectorate Militia
- 1st Robinson Chevaliers
- 1st Robinson Rangers
- 1st Robinson Strikers
- 1st Rochelle Protectorate Militia
- 1st Royal BattleMech Regiment
- 1st Royal Cavaliers
- 1st Royal Division
- 1st Royal Guards
- 1st Royal Mechanized Infantry Division
- 1st Saffel Protectorate Militia Division
- 1st Sakhalin Regulars
- 1st Sakhara Academy Training Battalion
- 1st Schedar Protectorate Militia
- 1st Scorpion Seekers (Clan Goliath Scorpion)
- 1st Scorpion Seekers (Escorpión Imperio)
- 1st Screaming Eagles
- 1st Shiloh Protectorate Militia
- 1st Shin Legion
- 1st Sian Dragoons
- 1st Sirian Lancers
- 1st Skallevoll People's Armored Regiment
- 1st Skallevoll People's Mechanized Regiment
- 1st Skandia Royal Militia Brigade
- 1st Skandia Royal Militia Brigades
- 1st Skye Jaegers
- 1st Skye Rangers
- 1st Somerset Strikers
- 1st Somerset Strikers (sourcebook)
- 1st Spinner (Clan Widowmaker)
- 1st Spirit of the Dragon
- 1st St. Ives Cheveau-Légers
- 1st St. Ives Lancers
- 1st St. Ives Sentinels
- 1st Star Sentinels (Clan Star Adder)
- 1st Steiner Strikers
- 1st Striker
- 1st Striker (Clan Smoke Jaguar)
- 1st Striker Payne (Clan Fire Mandrill)
- 1st Striker Regiment
- 1st Stygian Heavy Infantry Regiment
- 1st Succession War
- 1st Sun Zhang Academy
- 1st Sun Zhang Academy Cadre
- 1st Sun Zhang Training Cadre
- 1st Sword of Light
- 1st Syrtis Fusiliers
- 1st Syrtis Hussars
- 1st Syrtis Royal Infantry Regiment
- 1st Talitha Protectorate Militia Division
- 1st Tamar Hussars
- 1st Tamar Jaegers
- 1st Tamarind Regulars
- 1st Tamarind Regulars Regiment
- 1st Tania Dragoons
- 1st Tau Ceti Rangers
- 1st Taurian Guard
- 1st Taurian Lancers
- 1st Taurian Pride
- 1st Telos IV Protectorate Militia
- 1st Thorin Regiment
- 1st Tikonov Guards
- 1st Tikonov Lancers
- 1st Tikonov Protectorate Militia
- 1st Tikonov Republican Guards
- 1st Towne Protectorate Militia Division
- 1st Trader Sentinels
- 1st Trellwan Lancers
- 1st Triarii Protectors
- 1st Tybalt Protectorate Militia
- 1st Tyr
- 1st Tyr Assault (Clan Ghost Bear)
- 1st Tyr Assault (Rasalhague Dominion)
- 1st Ueda Cavaliers
- 1st Van Diemen Protectorate Militia
- 1st Vega Regulars
- 1st Vega Regulars (Rasalhague Dominion)
- 1st Victoria Lancers
- 1st Victoria Rangers
- 1st Viper Guards (Clan Steel Viper)
- 1st Volders
- 1st Volders Defense
- 1st Volders Regiment
- 1st Vulcan Armored Brigade
- 1st Wasat Protectorate Militia
- 1st Whitting Conference
- 1st Winfield Guards
- 1st Wing Protectorate Militia
- 1st Wolf Assault (Clan Wolf)
- 1st Wolf Cavalry (Clan Wolf)
- 1st Wolf Cavalry Assault (Clan Wolf)
- 1st Wolf Garrison (Clan Wolf)
- 1st Wolf Guardians (Clan Wolf-in-Exile)
- 1st Wolf Guards (Clan Wolf-in-Exile)
- 1st Wolf Guards Grenadiers (Clan Wolf)
- 1st Wolf Hussars (Clan Wolf)
- 1st Wolf Lancers (Clan Wolf)
- 1st Wolf Legion (Clan Wolf-in-Exile)
- 1st Wolf Regulars (Clan Wolf)
- 1st Wolf Strike Grenadiers (Clan Wolf-in-Exile)
- 1st Word of Blake Division
- 1st Yangtze Protectorate Militia
- 1st Yuki-Onna
- 1st Zion Protectorate Militia
- 1st Zollikofen Protectorate Militia
- 1st Zosma Protectorate Militia Division
- 1st Zurich Protectorate Militia Division
- 1st “Sarna” Lancers
- 20-Year Update
- 2000
- 2001
- 2002
- 2003
- 2004
- 2004th Battle Regiment
- 2005
- 2006
- 2007
- 2008
- 2009
- 200 Extralight
- 200 Extralight Fusion Engine
- 200 Fusion Engine
- 200 Internal Combustion Engine
- 200 XL
- 200th Aggressor (Clan Nova Cat)
- 200th Attack (Clan Ice Hellion)
- 200th Avalon Jump Regiment
- 200th Dragoon Regiment
- 200th Jump Infantry Division
- 200th Mechanized Infantry Division
- 200th Royal Light Horse Regiment
- 2010
- 2011
- 2012
- 2013
- 2014
- 2015
- 2015 BattleTech Video Game Crowdfunding Campaign
- 2016
- 2017
- 2018
- 2019
- 2019 Clan Invasion Crowdfunding Campaign
- 2019 Clan Invasion crowdfunding campaign
- 2019 Kickstarter
- 201st BattleMech Division
- 201st Battle Regiment
- 201st Division (ComStar)
- 201st Luthien Defense
- 201st Mechanized Assault (Clan Hell's Horses)
- 201st Pesht Assault Team
- 201st Pesht Reconnaissance
- 201st Republican Lancers
- 201st Striker Regiment
- 2020
- 2021
- 2022
- 2022 Mercenaries Crowdfunding Campaign
- 2023
- 2023 Mercenaries Crowdfunding Campaign
- 2024
- 2025
- 2026
- 2027
- 2028
- 2029
- 202nd Attack (Clan Coyote)
- 202nd BattleMech Division
- 202nd Battle (Clan Coyote)
- 202nd Firebrand (Clan Fire Mandrill)
- 202nd Mechanized Infantry Division
- 202nd Striker (Clan Steel Viper)
- 2030
- 2031
- 2032
- 2033
- 2034
- 2035
- 2036
- 2037
- 2038
- 2039
- 203rd Division (ComStar)
- 203rd Mechanized Infantry Division
- 203rd Striker Regiment
- 2040
- 2041
- 2042
- 2043
- 2044
- 2045
- 2046
- 2047
- 2048
- 2049
- 204th Jump Infantry Division
- 204th Reconnaissance Squadron
- 2050
- 2051
- 2052
- 2053
- 2054
- 2055
- 2056
- 2057
- 2058
- 2059
- 205 Fusion Engine
- 205 Light Fusion Engine
- 205th Assault (Clan Wolverine)
- 205th BattleMech Division
- 205th Dragoon Regiment
- 205th Heavy Assault Regiment
- 205th Hussar Regiment
- 205th Light Horse Regiment
- 205th Mechanized Infantry Division
- 205th Viper Striker (Clan Steel Viper)
- 2060
- 2061
- 2062
- 2063
- 2064
- 2065
- 2066
- 2067
- 2068
- 2069
- 206th Dragoon Regiment
- 206th Hussar (Clan Burrock)
- 206th Hussar (Clan Star Adder)
- 206th Jump Infantry Division
- 206th Royal Mechanized Infantry Division
- 2070
- 2071
- 2072
- 2073
- 2074
- 2075
- 2076
- 2077
- 2078
- 2079
- 207th Division (ComStar)
- 2080
- 2081
- 2082
- 2083
- 2084
- 2085
- 2086
- 2087
- 2088
- 2089
- 208th BattleMech Division
- 208th Division (ComStar)
- 208th Hussar Regiment
- 208th Jump Infantry Division
- 208th Mechanized Infantry Division
- 208th Striker Regiment
- 2090
- 2091
- 2092
- 2093
- 2094
- 2095
- 2096
- 2097
- 2098
- 2099
- 209th BattleMech Division
- 209th Light Horse Regiment
- 209th Mechanized Infantry Division
- 20 Fusion Engine
- 20 Year Update
- 20mm Gatling Gun
- 20th Alliance Guards Mechanized Infantry Regiment
- 20th Arcturan Guards
- 20th Army (Star League)
- 20th Avalon Hussars
- 20th Century
- 20th Crimson Guards (Clan Blood Spirit)
- 20th Dieron Regulars
- 20th Division
- 20th Division (Star League)
- 20th Division (Word of Blake)
- 20th Donegal Guards