Sky Girls, Girls & Panzer Recommendations
Although one is land based fighting, and the other is air based, they are both about girls that are experts in handling their heavy artillery that most would think only guys would be interested in. Also, even though both have competitions to show off their skills, Sky Girls is much more than that - these girls are actually involved in a war.
GuP is much lighter than Sky Girls. If you loved GuP, you will adore Sky Girls. If you liked Sky Girls, you'll love GuP. I do think that Sky Girls is better, however they are both good anime series ;D
If you liked the whole cute military theme with cool battles and great characters then Sky Girls is just as good as this one. Short cute and entertaining series