Strike Witches Maidens in the Sky Vol 1

Strike Witches by Humikane Shimada. An Action manga rated Teen, published in English by Seven Seas.

Humanity is at war with the alien Neuroi, and its best defense is the Strike Witches, a unit of magically gifted teenage girls who use special leg gear to fly into battle like human warplanes. Yoshika Miyafuji would rather use her powers to heal the sick than fight, but once her potential is discovered, she's recruited into the elite squadron.