Debbie, these are named floyd county units:

Floyd Game Cocks aka Floyd Game Bucks
Co G, 51st Regt Va Inf
8 men named wood - none in Co G - no A. J. Wood

Floyd Guards
Co K, 2nd Regt Va Inf
2 men named Wood - none in Co K - no A. J. Wood

Floyd Guards
Co B, 42nd Regt Va Inf
5 men named Wood - none in Co B - no A. J. Wood

Floyd Guard
Co A, 45th Regt Va Inf
John Wood - Co F - none in Co A - no A. J. Wood

Floyd Reserves
Co H, 4th Regt Va Inf
William & William J. Wood - none in Co H - no A.J. Wood

Floyd Riflemen
Co A, 24th Regt Va Inf
6 men named Wood - Samuel J. Wood in Company A - no A. J. Wood