{1=Obviously by a contractor, per the labelling on the diagram, and not by a US government employee. There is a general caution on US government sites that images may not be property of US government; that is clearly the case here

Extracted from: http://www.ed.gov/about/offices/list/os/technology/plan/2004/site/theplan/edlite-TearDownThoseWalls.html

Website from the US department of Education

	This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
इस फ़ाइल को कॉपीराइट कानूनों के अंतर्गत सभी संबंधित अधिकारों समेत ज्ञात सीमाओं से मुक्त पहचाना गया है।

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse