The U.S. military can be a funny place where troops do unusual and occasionally hilarious things in order to break up the monotony. Take, for example, the U.S. paratrooper who last year took a selfie photograph with his pet fish while parachuting in training.

Now there’s another example of parachuting hijinks circulating. A video posted this month appears to show a soldier solving a Rubik’s Cube while “under canopy.” He has just a few minutes to complete the puzzle, but does so with a camera on his helmet capturing the whole thing.

The video has generated a lot of questions. On the Facebook page “Do You Even Jump?” users questioned whether it actually could have been a jump by an active-duty U.S. soldier, considering he stays airborne for about 2 1/2 minutes. A traditional static-line jump carried out from a C-130 military transport plane from a height of about 2,100 or 2,200 feet would have been over much faster, they said. The jumper also appears to jump from a civilian plane using a European parachute, raising the prospect he isn’t American, others added.

The video also appeared on Reddit and YouTube, where one person questioned whether the video is fake.

This isn’t a first-time stunt, for the record. It’s part of a trend known as “speedcubing,” in which twisting puzzles like the Rubik’s Cube are solved as quickly as possible. In another parachuting version, a sky-diver completed a Rubik’s Cube while sitting in an inflatable boat during a sky-dive in August 2010. That video is here, and generated coverage from The Telegraph and other media outlets at the time:

In 2009, sky-diver Adam Morgan completed the feat from a height of 14,000 feet. That video is here: