The pride and joy of the Luke Air Force Base is grounded until further notice.

55 high-tech, state-of-the-art F-35 fighter jets won't be allowed to fly over the west Valley anytime soon. Military officials at Luke Air Force Base decided to stop flying the jets after five pilots experienced hypoxia symptoms over the past couple of months.

In each case, the plane's back up oxygen system kicked in to help the pilots land safely.

A spokesperson for the base says a team of military and medical experts will conduct "a technical analysis of the physiological incidents to date" involving the five pilots. The spokesperson added, "the safety of our airmen is paramount."

Pilots who experience hypoxia have a deficiency of oxygen to the body. It can cause impaired judgment, slow reaction time, headaches, blurred vision and even passing out.