I've never been one for power gaming or optimization.  I much prefer immersion.<br/><br/>That's why I say we get either an Elite Garrison, Elite Infantry, or Veteran Garrison with Green Archers.  House Greystark strikes me as a badass house with a strong martial tradition.  I can imagine them maintaining a small elite standing military, especially after Lewys' devastating losses in the Rebellions.  It also fits their history as an upstart and constantly endangered cadet branch.  They could even be ascended bodyguards, or have some cool name a la the mercenary companies in Essos.<br/><br/>Just my two pence.