Yes, I know. You've had problems during the Market Garden, as the Americans earlier.
Nowadays most of the landing performed with helicopters. I've had a discussion about that and guys from Israel say they've mostly rely on tactical landing via choppers during the Second Lebanese
I wouldn't say it's totally obsolete, but it's a rather specialised skill now.
Consider, if you will, the 82nd Airborne and the 101st Airborne Divisions of the US Army. The 82nd Airborne are still a parachute assault Division; the entire unit can be inserted into denied territory by air drop. The 101st, by contrast, is an air assault division, with lead infantry units intended to assault by helicopter to secure airfields for their armour to be flown in.
The really impressive thing is that the entire 82nd Airborne is required to be able to be deployed into combat at any point on the surface of the globe, within 120hrs.
I could imagine a "space" equivalent being supremely conditioned soldiers who are able to endure the rigors of repeated sub-space (or hyper space, or whatever your interpretation of high-speed inter-stellar travel is) travel in special craft designed to penetrate enemy defensive arrangements. Via these craft and punishing "drop ships" they are required to be able to deploy, in combat, to any planet in their designated quadrant in <5 days or something...
I guess what I am trying to say is that tradition is very strong in the military, and that names and identities are retained long after they become irrelevant, but that often those units perform the
equivalent duties. For example, in many modern militaries you still have mounted infantry and cavalry units, despite a decided absence of horses. But these units still perform the same battlefield role that they did ~200 years ago. Likewise, Line Infantry no longer fight shoulder to shoulder in line formation, but again, they perform the equivalent role.
So I could easily see the 82nd Airborne Division or the Parachute Regiment retaining its existing name and traditions, but becoming a "drop ship" unit.