Jordan was 41st in class standing upon graduation. As a result of this low standing he was appointed brevet 2nd Lt., 5th Infantry.
Graduates in the lower standings received brevet appoitments while those of higher standing were appointed to existing vacancies in the regiments and corps.
Jordan became 2nd Lt., 3rd Infantry in 1840, a 1st Lt. in 1846 and held that lineal rank until 1861. In 1847 he was appointed captain, assistant quartermaster and served in that capacity till 1861. No brevets for service in Mexico are credited to him.
Officers who were appointed asst. adjutant generals or asst. quartermasters held two commissions, one in their regiment and the staff commission.They were counted in the strength of their regiment but served in their staff capacity.
He resigned in 1861 and eventually became a brigadier general, CSA.
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