Although the official version focuses on the OTV-7 mission’s experiments with radiation and space tracking technologies, many details of the mission remain secret. The unique feature of this mission is its orbit, which takes the vehicle near or far from Earth. To replace this, the X-37B will reset its service module and then use atmospheric drag to slow down and minimize fuel consumption.
Air breaking has historically been used in planetary missions, but never in missions in Earth orbit.
Source: Ferra

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