CWS&SS shows...

Francis M. Langford
26th Mississippi Infantry
Company B
Soldier's Rank_In Private
Soldier's Rank_Out Private

G.A. Langford
26th Mississippi Infantry
Company B
Soldier's Rank_In Private
Soldier's Rank_Out Private
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Company B, the Boone Avengers were raised in Tishomingo County so I think this may be two of the brothers you mentioned. I did not see any listing that looked like a match for any Lester Langford.
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This is off Rootsweb so please confirm with further research...
Source:http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=:3237814&id=I626150363

Lester LANGFORD
Death: 2 Oct 1864 in Jones, TX, USA

Marriage 1 Martha A. CALVERY b: Abt 1836 in Oglethrope, GA, USA
Married: 14 Aug 1859 in Alcorn, Tishomingo, MS
Children
Billy LANGFORD b: Abt 1861