Ollies Army is best suited for training and combat operations in urban environments, while the Corps of Engineers is best for building, maintaining and repairing water, sewer and electric lines.
Ollie Army is the Army’s light infantry unit, while Corps of Engineer is the Corps’ light artillery unit.
The corps also operates the Army Base at Fort Carson, where most of the military’s weapons are stored.
But Ollys Army is well equipped for training, and the corps has more than 2,000 troops at Fort Hood.
Corps of Engineering, meanwhile, has about 3,500 troops and is better equipped to deal with a natural disaster.
For more on the military, check out The New York Times’ Military Index.