If you liked the Girls und Panzer anime, the Anime-Planet community thinks you'd like:
In the year 2079 CE, malevolent creatures known as Worms arrived in our galaxy, wiping out mankind quickly and efficiently. Finally, when the war's outcome seemed to favor the invaders, humanity united and nuked its own planet in order to survive. Though the Worms were defeated, 50% of the Earth's land mass submerged under the ocean, and 90% of all young men were killed in battle. Now, several years later, the Worms have returned. The world's best hope for survival is the genius Karen, the swordswoman Otoha and quick-thinking Eika; together, they make up the Sonic Diver Unit, a mechanized unit capable of taking down the Worms! Yet the powers that be are skeptical of its force and aptitude. Can the girls prove their worth, and take down the enemy?
Cute girls doing military stuff that is highly age-inappropriate, all for fanservice's sake - that sums up Girls und Panzer and Sky Girls alike. I didn't really enjoy either, but they will appeal to the same audience.
The Nation of Gallia has always remained neutral in conflicts and has only gone to war to defend itself. However, as war flares between the East Europan Imperial Alliance and the Atlantic Federation, Gallia is soon targeted for its abundance of ragnite ore, a versatile and hugely valuable material. The Civilian Militia is soon called into action, and Welkin Gunther - son of a legendary war hero - is named leader of Squad 7. Under his command are the headstrong and practical Alicia Melchiott; the sharp-tongued Brigitte Stark; the grizzled veteran, Largo Potter; and Welkin's adopted sister Isara, whose Darcsen heritage means she faces prejudice, even from members of her own squad. With the rest of Squad 7 and the mighty tank Edelweiss, they must do their best to defend Gallia.
Though a bit different for Girls und Panzer is a bit lighter, sweet and features younger characters while Senjou no Valkyria is more serious and features older characters, both shows can give you the action and enjoyment that you're looking for with some drama included.