And the thought crossed my mind: Imperial Marines in battledress and GCarriers. They're going to move really fast, have sensors that make even a small unit have a really wide front for envelopment, and individually are going to be armed heavily enough to squish just about anything.
Ok, I have been pondering this topic for a whiles...
First off, Combat Armor and Battledress ameliorate a lot of the side effects of explosive ordinance. I.e. Vastly reducing both Blast Effects and Fragmentation, which is the number one killer of infantry. The battle space becomes one dominated by precision weapons.
Honestly I feel that Grav Belts are as important to the equation. In that a lot of the traditional impediments of infantry movement are removed. Meaning even close to the ground many obstacles can be circumvented, coupled to a 3d choice of firing positions to the individual infantrymen is vastly improved.
As for weapon choices, the TL13 Laser Rifle is probably the line weapon of choice, it is fully effective vs Battledress.
I haven't even touched upon the ability enhancement of improved communications and related that advanced armor would also provide.
Coming back to the GCarrier, it becomes a mobile fire support platform and command and control hub. As well as a forward logistics carrier for the deployed infantry.
Where things get hairy is Urban Combat, kinda. In an asymmetric conflict the increased protection the armor provides makes building clearance for the higher tech force much safer. Near-peer conflicts will probably be just as much as a pain as they are today.
Actually my question is What does the logistics train look like for a Power Armor Infantry in operation.