Girls und Panzer specials with Yukari Akiyama explaining the background of tank units that appear in the series.
Bundled with the Blu-ray and DVD volumes releases of Girls & Panzer.

You may have heard of kung fu, but the girls at Oarai High School practice gun-fu—really, really BIG 75mm gun-fu, in fact. It's called Sensha-do, and it's the martial art of operating armored tanks! They take it seriously too, and since winning the national Sensha-do championship is such a huge deal at Oarai, they sometimes go to extreme ends in order to get the best students from Panzer class to sign up. Which is how Miho Nishizumi, who HATES operating tanks, gets drafted to join doomsday-driven driver Mako, even-triggered gunner Hana, highly receptive radio operator Saori and combustible tank-fangirl and loader Yukari as the incomparable Anko Team. They may not be on the half-track to fame and fortune, and maybe a few of them would rather shop for tank tops than become tops in tanks, but once their focus is locked and loaded, they're absolutely driven. 
(Source: Sentai Filmworks)

Two specials bundled with the Blu-ray and DVD releases of the Girls und Panzer Heartful Tank Disc. 
 
Episodes: 
- Fushou Akiyama Yukari no Sensha Kouza: Event Shutchou-hen - 4/28 Event de Joueisareta Sensha Kouza (秋山優花里の戦車講座～イベント出張編～：4月28日イベントで上映された戦車講座) 
- Fushou Akiyama Yukari no Sensha Kouza: Bangai-hen - Kesshousen ni Okeru Ryou Team no Senjutsu wo Kaisetsu (秋山優花里の戦車講座～番外編～：決勝戦における両チームの戦術を解説)

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