First Lieutenant, Engineer Corps, 1852-61.
- Assistant to Lt. Amiel W. Whipple during the Pacific Railroad surveys along the 35th Parallel, 1853-54.
- Commander of the Colorado River Expedition, 1857-58.
- Engineer and architect during the construction of the Washington Monument, 1859-60.
Colonel, CS Regular Army, 1861-65.
- Chief Engineer, Gen. R. E. Lee's staff, 1861.
- Aide to Confederate President J. Davis, 1862-65.
First Lieutenant, Engineer Corps, 1852-61.
- Assistant to Lt. Amiel W. Whipple during the Pacific Railroad surveys along the 35th Parallel, 1853-54.
- Commander of the Colorado River Expedition, 1857-58.
- Engineer and architect during the construction of the Washington Monument, 1859-60.
Colonel, CS Regular Army, 1861-65.
- Chief Engineer, Gen. R. E. Lee's staff, 1861.
- Aide to Confederate President J. Davis, 1862-65.
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