Avengers Assemble (Book 1)

Kyra was basically born and raised in the army, her father and mother were both integral parts of the higher command of operations within the British army. She quickly dove into her training and dedicated her entire life to becoming the greatest soldier she could be. She fell in love with tinkering and designing custom weapon attachments making her weapons quality much better, she became well versed in engineering and began crafting gadgets that would help her survive on the battlefield.

I don't own anything apart from my own ideas.