If you're looking for manga similar to Girls und Panzer: Introductions!, you might like these titles.
Noemi Kohiyama is a second-year student at Count High School, a school with no established reputation in the world of tankery. Her first match as a tank commander is against Saunders University High School. She directs the crew of her tank with her orders, and she follows the orders of their team leader. At that time, she remembers the words that her senior said to her.
Yosora Fujimitsu is a newly admitted student to North Gate National Military Academy, a school where the elite gather. Yosora possesses both beauty and intelligence, but he immediately feels uneasy at his new school. He thinks, "At this school, there's some kind of big secret." A vortex of speculations occupies Yosora as he's led toward that secret.
Nadeshiko Otemachi’s entire family are killed in a terrorist attack… A few years later, she enters into a military school for the sake of protecting Neo Tokyo. In order to get out of an awkward situation though, Nadeshiko decides to join the S Class, a specialist course for the most elite students in the school. But the S Class, and its S rank members, isn't exactly what she expects.
The story of a young man's journey to realise his life-long dream of becoming an air force pilot.