SteelStriker

Image can be found at https://www.needpix.com/photo/165678/memorial-birds-in-flight-sculpture-sky-bird-fly-wings-feather-wildlife

SteelStriker -- Book 2 of the Skyhunter Duologoy by Marie Lu

Text from the back cover:

Talin was taught loyalty is life. Loyalty to the Shield who watches your back, to the Strikers who risk their lives on the battlefield, and to Mara, which was once the last nation free from the Karensa Federations' tyranny. But Mara has fallen. Talin has no choice but to become the Federation's most deadly war machine as their newest Sky hunter. Red is no stranger to the cruelty of the Federation or the torture within its Skyhunter labs, but he knows this isn't the end for Mara -- or Talin. The link between them could be Talin and Red's only hope to safeguard their future.

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Ms. Sharp's quick review: I still can't believe it! Amazing action!