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I'm not sure that your camera info url is valid: http://www.ros.org/doc/api/camera_info_manager/html/classcamera__info__manager_1_1CameraInfoManager.html#_details

Try something like:

package://ros_package_name/calibrations/camera3.yaml

For you:

package://usb_cam/usb_cam.yaml

Also, to see if the published topic matches your calibration file.

rostopic echo /usb_cam/camera_info

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