Sentence:  The fullest cooperation by and with <WSD>Atomic</WSD> Energy Commission , the Department of Health Education and Welfare , the Department of State , and other concerned agencies shall also be carried out in the interest of achieving the objectives of this Act . 
Meaning of the word marked with <WSD> tags:  a former executive agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States