Statistics for occurrence #1 of “Acting-Asssistant Surgeon” in chapter 46 of Admiral David D. Porter, The Naval History of the Civil War.:

...rst-Assistant, D. Frazer; Acting-Second-Assistant, E. C. Maloy; Acting-Third-Assistants, Thos. Fitzgerald, G. W. Kiersted and Thomas Campbell. Acting-Volunteer-Lieutenant, John A. Johnstone; Acting-Asssistant Surgeon , T. M. Drummond; Acting-Assistant Paymaster, T. S. Dabney; Acting-Masters, J. F. Winchester and A. Cook; Acting-Ensigns, R. H. Cary, A. P. Sampson, S. H. Newman and S. A. Brooks; Acting-Master's Mate...
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Acting-Asssistant Surgeon 2 2 0 0 0 user votes

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