Convention of commanders. Sit: <a class="external text" href="https://en.wikipedia.org/wiki/Sergey_Ivanovich_Gusev">S.I.Gusev</a>, <a class="external text" href="https://en.wikipedia.org/wiki/Alexander_Yegorov_(soldier)">A.I.Egorov</a>, <a class="external text" href="https://en.wikipedia.org/wiki/Kliment_Voroshilov">K.E.Voroshilov</a>, stand: Petin N.N., <a class="external text" href="https://en.wikipedia.org/wiki/Semyon_Budyonny">S.M.Budyonny</a>, <a class="external text" href="https://en.wikipedia.org/wiki/Boris_Shaposhnikov">B.M.Shaposhnikov</a> (Retouched during the Soviet period to remove other prominent figures)
Unknown author<span style="display: none;">Unknown author</span>
Archive of the National Military History Museum of Ukraine. Photo album with Nicholas Petina’s photos, which remained in his family and later was handed over to the Museum of the Kyiv military district by his daughter Vera Petina.