No. | Portrait | Name | Term | Branch | Secretaries served under: | Ref. |
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Took office | Left office | Duration | War / Army | Defense |
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1 | | Young, Samuel Baldwin MarksLieutenant General Samuel B.
M. Young (1840–1924) | 15 August 1903 | 8 January 1904 | 146 days | Cavalry | Elihu Root | — |
2 | | Chaffee, AdnaLieutenant General Adna R.
Chaffee (1842–1914) | 9 January 1904 | 14 January 1906 | 2 years, 5 days | Cavalry | Elihu Root William Howard Taft | — |
3 | | Bates, JohnLieutenant General John C.
Bates (1842–1919) | 15 January 1906 | 13 April 1906 | 89 days | Infantry | William Howard Taft | — |
4 | | Bell, JamesMajor General J.
Franklin Bell (1856–1919) | 14 April 1906 | 21 April 1910 | 4 years, 7 days | Cavalry | William Howard Taft Luke Edward Wright Jacob M. Dickinson | — |
5 | | Wood, LeonardMajor General Leonard Wood (1860–1927) | 22 April 1910 | 21 April 1914 | 3 years, 364 days | Medica
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