Wait, Old Man’s War has FTL? Or was it important for in-system battles? I haven’t read them in a while.
I recently red The Star Carrier Series by Ian Douglas and that has FTL and interesting hard-sci fi battles with relativity effects.
I agree that the forever war is quite different in concept and style, much more esoterical.
OMW uses “skip drives” which are teleportation through multidimensional travel, time dilation is still a bit of a factor, but not nearly to the extent of The Forever War where it’s practically the whole idea (as far as the science in the sci-fi goes)
Yeah that’s how I remember it. The similar premise is that in both stories people leave earth and go on extended war campaigns.