The US Army Corp of Engineers, a concept started by George Washington. One of a kind , really.

"George Washington created the position of chief engineer at the outset of the Revolutionary War, to oversee the design and construction of military batteries and fortifications. The Corps was formally established in 1802. Combat engineers solve problems through math and physics: they move troops (build the bridge) and protect them from attack (blow up the bridge). The military runs the Corps, but ninety-eight per cent of the agency’s thirty-six thousand employees are civilians: geographers, biologists, ecologists, architects. The magazine Undark recently noted that the Corps, which operates under the Department of Defense, “has its fingers in everything from snowmelt modeling and wetlands plant inventories to research on stealth aircraft.”

​Urgent Care from the Army Corps of Engineers | The New Yorker