Erratum to mco p46007c ch 4 marine corps transportation manual 1 change the pcn at the bottom of the letterhead page to read pcn 102 058600 04 vice pcn 102 058600 00. The motor transport division mtd on major marine corps installations develops and implements policies provides oversight and guidance on operational and maintenance issues and provides direction when needed to respective fleet managers within the area in support of bases stations and operating forces within marine expeditionary force. The united states marine corps motor transport association inc is a 501 c 19 non profit organization operating exclusively for the purpose beneficial to the interests of the nation and united states marine corps motor transport occupational specialty field this association was formed to bring together all retired veteran marine active duty reserve and others who have served in or