I am looking for the unit that William Booker served in. He was born in Botetourt Co., and enlisted at the age of 16. I find 6 William Bookers listed. The units listed were 7th Batt VA Inf., 27th Reg. VA Inf., 53rd Reg. VA Inf., 21st Reg. VA Inf., 4th Batt. VA Inf., and 37th Reg. VA Inf. Any hints as to which of those units a 16 year-old from Botetourt Co. might have been assigned to?