Hi Donna,
My GGrandfather, Alfred Bryant, and his twin brother Alberry, were in Co. A (Calhoun Beauregards)of the 26-50th Alabama. You will find that there is much confusion regarding this unit and how they were formed. Much of the confusion derives from the fact that when the unit was assigned as Co. A of the 26th Ala. at Corinth, shortly before Shilo, those in command in the Western theater of operation did not know that there was already a 26th Alabama in the Army of Northern Virginia. When this was discovered some time later, the unit was redesignated as the 50th Alabama. Most historians now refer to it as the 26-50th in order to clearly designate what unit they are referring to. Apparently part of the original 26-50th was drawn from the consolidation of the 2nd and the 5th Alabama Inf. However, I have a copy of a hand written roster put together for the Alabama Department of Archives and History in 1909 by a member of Co. A. that indicates that they were actually originally part of the 19th Alabama under then infantry Colonel (later Cavalry General) Joseph Wheeler. During the early part of the war there was evidently much shifting and reassignment of units such as this. Microfilm records do indicate that Thomas K. Langford was the original 1st Lieutenant of the company which was commanded by Captain J.A. Sappington. However, Captain Sappington resigned in June or July of 1862, and it appears that your Langford was promoted to Captain at that time. The records also state that Langford died on July 28, 1864. Does that correspond with your information?
Here are the notes (as best as I can read them) written by E.D. Meharg (or Mehary) of Alexandria preceeding his listing from memory of the members of Co. A.:
Written to Mr. Thomas M. Owens, Montgomery, July 23, 1909

Dear Sir
As requested I hand you Roll Co. A 26-50 Ala Regt. This Co left this county Aug 10(?) 1861 for Huntsville with 10 other Cos they forming the 19th Ala. This Co being joined by other Cos was formed into a Regt at Corinth Miss in (illegible) March 62 and No (numbered) 26 and in the winter 63 at Dalton was reorganized and numbered 50th Ala. it (sic) was in Gladdens Gardners and Deas Brigades.

(He then lists the members of the company, including Thos K Langford 1st Lieut.) He concludes:

I give this list entirely from memory as I have no records no (sic) in touch with any members of the co there being only 3 of us living in the county and but few living else where should you need further information write me and I will give you all I can
Very Respect
E D Meharg

One suggestion: This board has been around for a while and the 26-50th has been discussed several times. Jim Martin has done an excellent job archiving past messages on the board. If you go to the top of the home page you will see a link to the archives. Type in 50th and you will find past discussions about the unit. You will also find a brief history of the unit in Willis Brewer's Alabama: Her History, Resources, War Record, and Public Men From 1540 to 1872, available at most libraries in Alabama. The same information was reproduced from that book by the ADAH under the title Brief Historical Sketches of Military Organizations Raised in Alabama During the Civil War.

Good luck with your search, and let me know if you come across other information.
Rick