A T-55AM2 in the National Museum of Military History, Sofia. Note the red star on the front hull, a symbol used both by the Soviet Red Army and the Bulgarian People's Army.
<a href="//commons.wikimedia.org/wiki/User:Tourbillon" title="User:Tourbillon">Tourbillon</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>