UAP sighting Yuma Az

UAP sighting Yuma Az
TIME: 2:33PM march 9th 

Location: Yuma Arizona Fortuna foothills 

What do you all think it could be? I watched it for around 5 minutes before it disappeared, it moved the same speed throughout the encounter. Do you think it could be a ballon? I used an iPhone 15 pro to capture it. I did my best to record and focus. I was able to get a decent focus on it in some parts. Im lost on what it could be. I do know they have the Yuma proving grounds not far from here. I’d love to hear what you all think? Thank you.