By: http://www.airforcetimes.com/story/military/pentagon/2015/01/28/kc-135-makes-emergency-landing-at-wisconsin-airport/22454487/,

MILWAUKEE — Authorities are investigating after a military plane was forced to make an emergency landing at Mitchell International Airport due to mechanical issues. An official with the Wisconsin Air National Guard 128th Air Refueling Wing says a KC-135 Stratotanker returned to the airport Tuesday night in the midst of a training mission after crew members noticed smoke and fumes in the cockpit. Master Sgt. Tom Sobczyk says no injuries were reported and the aircraft landed safely at the airport just before 9 p.m. Officials say the smoke and fumes were caused by a battery charger that failed. An investigation into the incident will attempt to determine why the battery failed.