Official Publications of the Headquarters

This collection of publications is the single official repository for official U.S. Army Corps of Engineers (USACE) Engineering Regulations (ERs), Engineering Circulars (ECs), Engineering Manuals (EMs) and other official public documents originating from Headquarters USACE.

In order to read or print these documents, you must download the free Adobe Acrobat Reader available at

These publications are provided in secure portable document format (PDF). Our document security allows for reading, high resolution printing, and accessibility for the blind.


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