AN ex-Navy pilot has shared his reaction to unexplainable alleged UFO sightings while flying his jet.

Lieutenant Ryan Graves said his squadron began seeing UAPs  - unidentified aerial phenomena, or UFOs - for the first time in late 2013 or early 2014.

In a new episode of The Joe Rogan Experience, Graves shared tales of his encounters with unidentified objects in the sky.

"We did witness something while we were flying in our jets but we witnessed it in the context of our just everyday flying," Graves said.

"For me personally, the experience was simply just flying out to the area like I would any other day.

"And instead of seeing an empty airspace ... there were all of a sudden a lot of different radar contacts, which is immediately a problem because we could be hitting one of those or someone working in our area."

To read more and view the video, click here.