Hand-held maneuvering unit

It provided an impulse to send the space-walker away from and back to the spacecraft, and was the easiest way for them to control their motions in the microgravity environment.

[1][3] Ed White enjoyed using the gun[4] and found it useful,[5] but quickly ran out of propellant, forcing him to pull on his tether to continue maneuvers.

However, fellow crewman James McDivitt recalled the gun as being "hopeless" and "utterly useless" as it required precise aim through the user's center of mass in order to translate in a straight line without inducing unwanted rotation.

[1] Astronaut David Scott never got a chance to use it, because the mission had to be terminated before his EVA due to a critical thruster problem.

The Gemini 10 device used by Michael Collins received its nitrogen gas propellant from inside the spacecraft, through a hose bundled with the astronaut's umbilical connector.