Two Diedrich Kastens served in Mo EMM units:
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(1) Diedrich born ca 1833 of Lafayette County (Diedrich Karsten in Mo Archives)

enrolled Aug 1862 Lexington, Mo in 71st Regt. EMM, released Dec 1962
http://www.sos.mo.gov/Images/Archives/Military/s00807/s00807_0207.pdf

Killed by bushwhackers 13 July 1863, buried Concordia, no stone.

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(2) Diedrich born ca 1820 of Morgan and Pettis County (Diederick Kastens in Mo Archives)

enrolled July 1863 Syracuse, Mo in Co. B 9th Prov. Regt. EMM, released Nov 1863.
http://www.sos.mo.gov/Images/Archives/Military/s00821/s00821_2250.pdf

Died 1906, Smithton stone reads "Dedrick Kastens CO B 71 EN MO MIL"
but 1892 pension application reads "Diedrick Kestens, B 9 Prov Co Mo Mil"

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So #2's stone apparently lists #1's unit! (Not my kin just wondered if common)