On October 8, 1907 the War Department issued Circular No. 68 that described new insignia to be worn on the standing collars of enlisted men's service uniforms. These were to have been two pairs of one inch bronze disks. On each side of the collar there was a pair, one bearing the letters U.S. and the other the branch of service. The insignia were attached by a threaded post and thumb screw nut. Older enlisted insignia that were in use were cut out emblems of the service branch similar to officer's collar insignia. The edges of the cut out insignia snagged on brush and the insignia came loose. The pins frequently broke on these and it was hoped that these new disks would be nearly indestructible. A second circular No. 78 of November 17, 1909 delayed the implementation to July 1, 1910. Not long afterward the decision was made that each soldier would wear a total of two disks rather than four with the right one being the U.S. and the left one being the branch. Certain of the disks included the regiment number and company letter on the face. The earliest of these disks are referred to as Type I disks. This type was in use from 1910-1924 and was the type used during the First World War. 

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