- Ray, Isaac, 1807-1881, author6
- Reynolds, Edward, 1860-1936, author6
- Ringer, Sydney, 1835-19106
- Robbins, Henry Alfred, 1839-1911, author6
- Roberts, John B. (John Bingham), 1852-19246
- Roe, John O.6
- Rohé, George H. (George Henry), 1851-1899, author6
- Shufeldt, Robert W. (Robert Wilson), 1850-19346
- Shurly, E. L. (Ernest Lorenzo), 1845-1913, author6
- Smith, Andrew H. (Andrew Heermance), 1837-1910, author6
- Souchon, Edmond, 1841-1924, author6
- Squibb, Edward Robinson, 1819-19006
- Stimson, Lewis Atterbury, 1844-1917, author6
- Swinburne, John, 1820-18896
- Thompson, Henry, Sir, 1820-19046
- Thornbury, Frank J., 1870- author6
- Thorner, Max, 1859-1899, author6
- Toner, Joseph M. (Joseph Meredith), 1825-1896, author6
- Trall, R. T. (Russell Thacher), 1812-1877, author6
- United States. Army. Department of Texas.6