His records do not show a rank as Lieutenant. It is possible that his widow’s pension application recorded this rank. Or, perhaps his record is confused with that of Lt. Beck of the 27th Arkansas Infantry

Oliver Perry Beck

Residence was not listed;
Enlisted as a Corporal (date unknown).
"F" Co. MO 3rd Cavalry
born in 1831
died in 1912
Buried: Janes Cemetery, Randolph Co., AR

(Wife: Elizabeth Young)

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records
- Various Cemetery listings on the internet

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Oliver P. Beck, Private, Company F, 3rd Regiment Missouri Cavalry, enlisted March 1, 1863 in Izard County, Arkansas by Capt. Randall for 3 years, paroled at Shreveport, La., June 7, 1865, recorded as 2nd Sergeant, resident of Izard County, Arkansas, no other records

Note, there are only 3 cards in his file which record his rank as below:

Card 1 Private In Corporal Out [Index Card]
Card 2 Private Jan/Feb, 1864 Muster - Present
Card 3 2nd Sergeant POW - Paroled June 7, 1865

Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Missouri

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Arkansas, Confederate Pension Records, 1891-1935

Name: Oliver P . Beck
Spouse Name: Eliza Beck
Residence Location: Sharp, Arkansas
State Served From: Missouri
Division: Cavalry
Company: F
Regiment: Sharp
Vet Application Year: 1901
Death Date: 28 Apr 1913
Comments: Widow applied 1913 Lawrence Co.

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U.S. Civil War Soldiers, 1861-1865

Name: Oliver P . Beck
Side: Confederate
Regiment State/Origin: Arkansas
Regiment: 27th Regiment, Arkansas Infantry
Company: H
Rank In: Second Lieutenant
Rank Out: Second Lieutenant
Film Number: M376 roll 2

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Oliver P. Beck, 32, 3rd Lieutenant, Company H, 27th Arkansas Infantry, enlisted June, 1862