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It will, as stated, depend on the chapter but I think that there are plenty of positions in their structures for experienced SM that are not battleline ready.

Pilots (assuming the controls go through their neural link like the armor and not by hand/foot), teachers, logistics, wardens, recruiters, honor guard, rear guard, etc...

Even a partially diminished marine is still powerful compared to most.

I think part of the issue might be how it's perceived by the SM (and the Chapter) though.

Luther and the Calibanite DAs definitely bristled at be sidelined to non-combat duties (maybe moreso because they weren't infirm?).

Some might accept their fate as an honorable way to still serve (somebody has to do it and why not free the able to go to the front), some might prefer to go out in a blaze.