|Czechoslovak military units in the USSR (1942 - 1945)|
An overview of military archives where information can be obtained about members of Czechoslovak military units and ways, how they entered those units. But before that, I recommend to visit section Searching of relatives.
Vojenský ústřední archiv
Military Central Archive in Prague
Web: http://www.vuapraha.cz [in Czech]
Part of the central archive is the Military Historical Archive, whose 1st department contains, among others, funds and collections of Czechoslovak foreign resistance in the years 1939 - 1945, including the personal files 1 of members of Czechoslovak units born before 1910 and personal files of officers born until 1905.
Vojenský historický ústav
Military Historical Institute in Bratislava
Web: http://www.vhu.sk [in Slovak, English]
Part of the Institute is the Military Historical Archive, which administers, among other things, the personal files 1 of members of Czechoslovak units born between 1911 and 1920.
Vojenský archív - centrálna registratúra
Military Archive - Central Registry in Trnava
Archive manages the personal files 1 of members of Czechoslovak units born in 1921 and personal files of officers born after 1905.
Rossijskij gosudarstvennyj voennyj arhciv
Russian State Military Archive in Moscow
Web: http://rgvarchive.ru [in Russian]
Archive manages, among others, documents and files of prisoners of war, interned and deported persons between 1939 and 1960.
Glavnyj informacionno-analiticheskij centr Ministerstva vnutrennih del Rossijskoj Federacii
Department for the rehabilitation of victims of political repression and archival information of the Information center of Interior Ministry of the Russian Federation in Moscow
Web: https://xn--80a2aw.xn--j1adp.xn--b1aew.xn--p1ai/folder/9726856 [in Russian]
Archive manages, among other things, the documents of the GULAG system and the files of the persecuted persons.
Centralnyj archiv Ministerstva oborony Rossijskoj federacii
Central Archive of the Ministry of Defense of the Russian Federation in Moscow
Web: http://archive.mil.ru [in Russian]
Archive manages, among other things, the files of participants of the Great Patriotic War.
Hadtörténeti Intézet és Múzeum - Hadtörténelmi Levéltár
Institute and Museum of Military History - Military History Archives in Budapest
E-mail: email@example.com or firstname.lastname@example.org
Web: http://militaria.hu/adatb/leveltariuj/kapcsolat/hadtortenelmi_leveltar [in Hungarian]
Web: https://portal.ehri-project.eu/institutions/hu-002738 [in English]
Register of the members of the Hungarian Royal Army, including those, who later entered the Czechoslovak army. Unfortunately, most of the military files was destroyed at the end of war. For a faster response I recommend writing a request in Hungarian.
Deutsche Dienststelle in Berlin
Web: http://dd-wast.de [in German, English]
Alphabetical Central Registry with over 18 000 000 record cards of persons who served in W.W.II (soldiers of the Wehrmacht and members of other military/para-military organizations).