Note:  the photos below make up one large photo.  These are the faces of those who tackled the enormous feat of hiring and placing workers at the Powder Plant. 

His occupation was rigger and his pay was listed as "55".  The time was July 1918 and the man was Harvey Morris.  He is the great uncle of  Neal Hancock (Sontara®).
The following information is taken directly from David Brand's Thesis at Vanderbilt University -  "Fill the Empty Shell: The Story of the Government Munitions Project at Old Hickory, Tennessee 1918-1919" –  May 1971

Du Pont set up an employment office in Nashville in February, 1918.

In the early stages of the construction, enough workers were available in the Nashville area, but as the need for more workers arose, labor recruiters were forced to travel farther from Nashville to find the needed numbers of men. Competition from other wartime industries and the real shortage of manpower necessitated recruiting throughout the South and Southwest.

The task of recruiting sufficient laborers proved to be a continuing and problematic undertaking. Competition among labor recruiters from the various defense projects and the bitterness of employers whose workers deserted their old jobs to flock to the higher paying jobs at the munitions plants complicated the problems of expanding the work force at Old Hickory. On April 13, 1918, two representatives of the Du Pont Engineering Company were arrested in Chattanooga, Tennessee, for recruiting workers. Local police charged them with doing business without a license upon the complaint of local manufacturers, who accused them of attempting to entice workers away from their jobs in the city. Recruiters from the Pittsburgh Plate Glass Company were similarly charged in Nashville when they attempted to hire men for their Pittsburgh plant.

The competition for laborers and the lack of specific and enforced regulations defining acceptable labor procurement policies caused continual conflict. War Labor Board officials in Washington designated general geographic areas wherein the various munitions plants were to have exclusive recruitment rights, but there is little to indicate that these guidelines were observed. Du Pont Company correspondence between Old Hickory, Wilmington, and Washington, D.C. contains repeated references to incursions of other companies and modifications in Du Pont's recruiting program brought about by the competitive market for workers.

Powder Plant News - August - 1918
Can't Loaf On Job
A warning against loafing has been posted near every tempting shade at the powder plant.  Any man who, finding an excuse to get from under the eyes of his foreman for a few moments seeks a few minutes respite from the torrid sun may be notified by a policeman that his pay will be a little short as a result.  The penalty is one hour's pay for the first offense, two hours for the second, while the third offense a man will be discharged.
Our Office Your Office
An invitation is extended to the employees of du Pont Engineering Co. and the Mason & Hanger Co. to make our office, 1017 Independent Life Bldg., their headquarters while in the city.  If you wish to have a friend meet you, meet him here.  If you wish to write a letter you will find stationery and a stenographer at your disposal.  A directory of boarding and rooming houses, such as you would be willing to make your home, will be open to our friends, and any service or information will be furnished free of charge.  We wish to do our bit in making our new citizens feel at home.  To that end we expect to keep "open house" for the employees of the plant.
The Arm of the Working Man
It was no less a soldier than the great Hannibal who said that the blow of the workman on the anvil was equal to the blow of the soldier on the field of battle.

It is truly so.

Working men of the Powder Plant, we realize the fact that Uncle Sam has no braver, no nobler soldiers than those who are bringing from the cotton and corn field a fortress that will hurl bolts of thunder to destroy his enemies and the enemies of mankind.  In truth and in fact you are on the firing line.  In truth and in fact you are doing much to stop the Hun, by your faithful, untiring and laborious work, as those who are standing on the front line of battle.  For without the product of your labor the Hun would walk with butchering fury over the civilized world.  And rest assured that your country knows it.  Be assured of their confidence and faith in you, a Unit of the great army of working men, an arm of the great body of labor in the United States.

And now to the point:  Conditions may not be, for the present, as good as they might be at the Powder Plant.  A few months ago, between the banks of the Cumberland at Hadley's Bend lay only this great field ready for the plow.  Today, by your effort, smokestacks with plumed pinions stand in the sky, turrets of steel, in the citadel of a conquering nation.  This has been done under most adverse conditions and trying circumstances, but remember that as our brave boys now live in the mud and blood of trenches unsheltered, often, from pitiless skies of rain and snow and sleet, surely you can stand a few of these unavoidable inconveniences.

The boys at the front are living under cruel conditions; surely without protest and without complaining and with that faith and patriotism which have always characterized American working men you will not grumble at your conditions. 

There is no excellence without great labor, saith the Latin poet.  There is no sweetness of compensation without great service, say we.