This info is from the CWS&S at http://www.itd.nps.gov/cwss/soldiers.cfm

GP
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Bartlett Stanley (First_Last)
Regiment Name 5 U.S. Vol. Infantry
Side Union
Company D
Soldier's Rank_In Pvt.
Soldier's Rank_Out Pvt.
Alternate Name B./Stanley
Notes
Film Number M1290 roll 21
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Bartlett Standley (First_Last)
Regiment Name 5 U.S. Vol. Infantry
Side Union
Company D
Soldier's Rank_In Pvt.
Soldier's Rank_Out Pvt.
Alternate Name Bartlett/Stanley