DD Form 2490-21 or the "Network Planning And Configuration Data - Digital Loop And Trunk Worksheet" is a Department of Defense-issued form used by and within the United States Army.
The form - often mistakenly referred to as the DA form 2490-21 - was last revised on February 1, 1987. Download an up-to-date fillable PDF version of the DD 2490-21 down below or find it on the Department of Defense documentation website.
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