KATWIJK, the Netherlands — Its wings beating against a gathering breeze, the eagle moves gracefully through a cloudy sky, then swoops, talons outstretched, on its prey below. The target, however, is not another bird but a small drone, and when the eagle connects, there is a metallic clunk. With the device in its grasp, the bird of prey returns to the ground. At a disused military airfield in the N
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