The GRU's first predecessor in Soviet Russia was established by the secret order signed on 5 November 1918 by Jukums Vācietis, the first commander-in-chief of the Red Army (RKKA), and by Ephraim Sklyansky, deputy to Leon Trotsky, the civilian leader of the Red Army. (Since 2006, the Russian Federation has officially observed the date of 5 November as the professional holiday of military intelligence in Russia.) The military human intelligence service thus established was originally known as the Registration Agency ("Registrupravlenie", or "Registrupr"; ) of the Field Headquarters of the Revolutionary Military Council of the Republic; Simon Aralov was its first head. Its early history was marked by a series of reorganisations influenced by the Soviet-Polish War, the consolidation and restablisation of the Soviet Union, and the general reorganisation of the Red Army; this included changes to its name, status, and responsibilities.