Color is not claimed as a feature of the mark.
"ADMINISTRATION"
The mark consists of stylized block letters "NNSA", with the second "N" defined by negative space, with all letters set at an angle, and an atomic symbol overlaid on the "A" with three overlapping spherical elements forming the center of the atomic symbol, with the stylized block letters positioned over the words "NATIONAL NUCLEAR SECURITY ADMINISTRATION".
As to "NATIONAL NUCLEAR SECURITY ADMINISTRATION"