Microsoft said Wednesday that it would begin producing more than 120,000 augmented reality headsets for Army soldiers under a contract that could be worth up to $21.9 billion.

The HoloLens headsets use a technology called the Integrated Visual Augmentation System, which will equip soldiers wearing them with night vision, thermal vision and audio communication. The devices also have sensors that help soldiers target opponents in battle.

The deal is likely to create waves inside Microsoft, where some employees have objected to working with the Pentagon. Employees at other big tech companies, like Google, have also rejected what they say is the weaponization of their technology.

But Microsoft has long courted Defense Department work, including a $10 billion contract to build a cloud-computing system. Amazon had been seen as a front-runner to win the contract, but the Defense Department chose Microsoft.