I agree that SCAR has a lot of useful information - I've particularly enjoyed their magazine archives online. However, once you find your ancestor in their ARW pension transcripts, it may be worth your while to follow up by searching for him in the ARW pension files at footenote.com. There you can see the entirety of the pension file as images of the originals.

Just a for instance: An ancestor of mine (James Johnson of SC - W9088) has a 1 page transcript in the SCAR files, but it's close to 90 pages worth on footnote. This tile is probably outside the norm, but it certainly points out the possibility of missing a good deal of information if you don't follow up.

Regards,
Penny