Maybe some of them could benefit from tighter crops, which can be easily done. A couple could do with a splash of fill light being added at the time. But irrespective..there are some real characters there which would be great to revisit if the opportunity arrives again.
I love that the old boy in number 5 has his camouflage t shirt on under his jacket, a tighter crop on number 1 would certainly make it a stronger image, but good work documenting these old war horses.