Wachregiment Feliks Dzierzynski was a Stasi unit (Ministerium für Staatssicherheit) which among other things provided the honor guard for ceremonial occasions within the Berlin city limits where NVA troops were forbidden to be stationed according to agreements between the allies after the end of the Second World War.

Wachregiment Feliks Dzierzynski recieves its honor title from Generaloberst Erich Mielke 15 December 1967

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Soldier from Wachregiment Feliks Dzierzynski during the ceremony to mark the renaming of the Tilsiter Straße to Richard-Sorge-Straße on 6 November 1969

(Courtesy of Bundesarchiv/Wikimedia, licensed under Creative Commons Attribution ShareAlike 3.0 Germany) 

Soldiers from Wachregiment Feliks Dzierzynski during the ceremony to mark the renaming of the Tilsiter Straße to Richard-Sorge-Straße on 6 November 1969

(Courtesy of Bundesarchiv/Wikimedia, licensed under Creative Commons Attribution ShareAlike 3.0 Germany)

Reference material on this unit

Hagen Kuch & Peter Joachim Lapp - Die Garde des Erich Mielke: Der militärisch-operative Arm des MfS / Das Berliner Wachregiment "Feliks Dzierzynski"