The company ILC Dover made the Mark III suit as a technology demonstrator in 1992. It actually was a zero prebreathe suit. It is pressurized to 57 kPa, which is close enough to the kPa used in NASA habitat modules so that the bends is not an issue. The Mark III had the shell covering the entire torso, not just the chest like the EMU. There is a hard upper torso, a hard lower torso. There are bearings at shoulder, upper arm, hip, waist, and ankles. There are soft fabric joints at elbow, knee, and ankle. I do not know why there are both types of joints at the ankles.
One point that is commonly brought up in the discussion of space warfare is the three-dimensional nature of space, and the need to think in three dimensions. While this is technically true, it is probably not as big of a factor as it is often portrayed to be. First, efficient transfers will be in the ecliptic plane, which means that most of the deployments will be made in that plane, in two dimensions. Even if one side chooses an inefficient transfer to avoid this, they would have to split up their force on the way to achieve meaningful separation between its elements, throwing away any advantage of surprise it might give them. Second, ships will be generally unable to maneuver in combat (as described above), limiting the impact of any brilliant 3-D tactics, as the opponent will have plenty of time to respond. Third, humans have been fighting in a 3-D environment for almost a century, and with a little bit of training, most people do not seem to have a problem thinking in 3-D. All but the most inexperienced officers will be familiar with the fact that space is not 2-D, and react accordingly.
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