Because of his experience as a topographical engineer and cartographer, he was in great demand within the Army.

From 1855-1858 he was the chief topographical engineer for the Department of the Pacific.

Lieutenant Mullan, a topographical engineer, began gathering information in 1854.

Wise was, however, taken seriously enough by the Topographical Engineers to be asked to build a balloon.

Trained as a topographical engineer, Fremont possessed an expertise unprecedented in western exploration.

William H. Emory was most importantly a topographical engineer and explorer.

Assigned as a topographical engineer, he worked on numerous surveys in Texas, the Upper Midwest and other western states.

He was then briefly assigned as a Topographical Engineer in the Department of the Gulf.

He served as a topographical engineer until 1828, when he took a leave of absence from the Army to visit Europe from 1828 to 1830.

Lieutenant Emory, topographical engineers, acted as assistant adjutant-general.