Yo, Tom!
The other series is about the OSS (Office of Strategic Services - predecessor to the CIA) in WW II. Griffin (real name: William E. Butterworth) is a good author and a hell of a nice guy to boot! He calls it the 'Argentine series', for lack of a better title.
I think the 'Brotherhood of War' series (the Army series) has pretty much run its course, unless Griffin writes a 'filler' novel that covers the gaps in time in some of the original books.
'The Corps' suddenly jumped to the Korean War... I was looking forward to seeing the rest of McCoy, Pickering and company survive through the rest of WWII.
'Badge of Honor' is pretty decent, though the original books were written in the early 70s and appear somewhat dated.
But I still prefer to kick back and relax with a James Bond novel. (And a martini, shaken not stirred.) Can't beat Ian Fleming, John Gardner wasn't bad, and Raymond Benson is improving.