Editing Jet pack (section)

==Government==
===Space===

[[File:Bruce McCandless II during EVA in 1984.jpg|thumb|[[Bruce McCandless II]] operating the [[Manned Maneuvering Unit]]]]
{{main|Astronaut propulsion unit}}
Rocket packs can be useful for [[spacewalk]]s. One example is the Manned Maneuvering Unit (or MMU), which weighed approximately 300 pounds and was affixed with two propellant tanks that supplied 24 small thrusters with 40 pounds of high-pressured gaseous nitrogen.  It was first used by astronauts Bruce McCandless and Bob Stewart in February 1984.<ref>{{Cite journal |last=Chaikin |first=Andrew |date=April 2014 |title="Weightless" |url= |journal=Smithsonian |volume=45 |issue=1 |pages=72–73 |via=EBSOCOhost}}</ref><ref>{{Cite web |last=Evans |first=Ben |date=February 2024 |title="Buck and Flash": Remembering the First Flights of the Manned Maneuvering Unit (MMU), Forty Years On |url=https://www.americaspace.com/2024/02/03/buck-and-flash-remembering-the-first-flights-of-the-manned-maneuvering-unit-mmu-forty-years-on/ |access-date=December 7, 2024 |website=America Space}}</ref>  While near Earth a jet pack has to produce a [[g-force]] of at least 1{{sp}}g (a smaller g-force, providing only some deviation from [[free fall]] is of little use here), for excursions outside a free falling spaceship, a small g-force providing a small deviation from free fall is useful. Hence much less [[delta-v]] is consumed per unit time, and not during the whole EVA. With only small amounts of [[thrust]] needed, safety and temperature are more manageable than in the atmosphere in Earth's gravity field.

Nevertheless, it is currently worn to be used only in case of emergency: the [[Simplified Aid For EVA Rescue]] (SAFER).