A NATO E-3 Sentry almost hit the tail of the tanker and its flying boom during air-to-air refueling operations. Not only the close proximity of the two large planes was dangerous, but also the evasive maneuver the pilot performs to avoid collision: the AWACS pulls several negative G-forces to gain quick separation from the refueller.
This was not an official video, and was not approved for release by the Air Force Safety Office.
Source: YouTube