Junior Lieutenant Maleshkin, an unshooted graduate of the school, commands the crew of the self-propelled gun SU-100. All the subordinates of Maleshkin are older than him and much more experienced. The authority of the young commander is tested at every step, he quarrels, then reconciles with his crew.
| Actor | Role |
|---|---|
 Mikhail KononovSanya Maleshkin | Sanya Maleshkin |
 Oleg BorisovMikhail Domeshek | Mikhail Domeshek |
 Viktor PavlovGrisha Shcherbak | Grisha Shcherbak |
 Fyodor OdinokovOsip Byankin | Osip Byankin |
 Boris TabarovskyBezzubtsev | Bezzubtsev |
 Mikhail GluzskiyDey | Dey |
 Pyotr LyubeshkinOvsyannikov | Ovsyannikov |
 Valentin ZubkovBasov | Basov |
 Boris ArakelovCheginichka | Cheginichka |
 German KolushkinTelenkov | Telenkov |
 Pyotr GorinSergachyov | Sergachyov |
 Boris SichkinSelivanov | Selivanov |
 Yuriy DubrovinGromykhalo | Gromykhalo |
| IIrina ZamotinaAntonina | Antonina |
| VViktor KurochkinPriest (uncredited) | Priest (uncredited) |
| AAleksandr YaroshevskiyRezo (uncredited) | Rezo (uncredited) |
 Viktor TregubovichShaginyan (uncredited) | Shaginyan (uncredited) |
| AAleksey Strelkov(uncredited) | (uncredited) |
| VVladimir MalyarTank driver (uncredited) | Tank driver (uncredited) |
| GGrigoriy GrigoriychukGuard at the trophy home | Guard at the trophy home |
 Vladimir KarpenkoNot listed | Not listed |
| DDmitriy MakhnichNot listed | Not listed |
| NN. KutsevalovKenarev | Kenarev |