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DA Form 3126-1 – Army Pubs DA 3126-1 Fillable – The Department of the Army (DA) produced DA Form 3126-1 (Application and Agreement for the Establishment of a National Defense Cadet Corps Unit) on March 1, 2000, and it is a military form used by the National Defense Cadet Corps. According to some sources, it is known incorrectly as the DD Form 3126-1, however, it is a military form used by the United States Army and among its ranks. As of right now, the DA does not give any specific directions for completing the form.