REFERENCE: AR 614-200
Soldiers interested in reclassification of your PMOS must submit DA Form 4187 through your chain of command to the Installation Human Readiness Support Center, Bldg 465, Rm 134. Generally, you may reclassify to an understrength MOS from a balanced or overstrength MOS. However if your MOS is critically short, chance for reclassification is poor.