Question: Is the Commercial and Government Entity (CAGE) code and part number (PN) stock listed?
If Yes:
Requisition existing National Stock Number (NSN) from service supply system.
If No:
Base/Unit supply section submits a DD Form 1348-6 requisition using the manufacturer’s CAGE & PN
Question: Would the Base/Unit purchasing authority like to do a local purchase?
If Yes:
An NSN is not always necessary for acquisition, though it can make it easier for a unit to order. Ordering using MILSTRIP may take higher authority and can cause delays. A unit can also do a one-time buy for an item or set up a revolving contract with a vendor to fulfill requirements.
Note: As an alternative to establishing an NSN for materials, vendors can upload their items to FedMall for ease of buying with unit issued government purchase cards.
If No:
The Base/Unit authority will forward the CAGE & PN requisition to their service logistics command.
Question: Does the military service deem an NSN is necessary?
If Yes:
Military Service logistics command sends the cataloging request for the NSN assignment to Logistics Information Services.
If No:
The item will not have an NSN assigned. Contact your logistics command
Army Process for Requesting a New NSN and NSN Maintenance Action.
All requests for NSN assignment or maintenance to an existing NSNs need to come from AESIP-LMP. Contact the appropriate Army Material Master Cell LCMC points of contact – AR 708-1
AMCOM:   usarmy.redstone.amcom.mbx.immc-material-master-cell@army.mil     
CECOM:   usarmy.apg.cecom.mbx.lrc-ltsd-master-data-support@army.mil 
CECOM CSLA:  usarmy.huachuca.usamc.mbx.material-master-support@army.mil
TACOM:   usarmy.detroit.tacom.mbx.ilsc-material-master@army.mil
PEO Soldier – Soldier Enhance Program:   https://www.peosoldier.army.mil/SEP/ 
The USMC uses the Technical Data Management – CATALYST application for Weapon Systems Repair, Parts Provisioning and Cataloging.
Marine Corps Logistics Command –   http://www.logcom.marines.mil/
Email:   smblogcomwsmcwipddmt@usmc.mil
Marine Corps Systems Command –   https://www.marcorsyscom.marines.mil/
Email:   mcsc.lcl.support@usmc.mil
Email:   Catalyst_Support@usmc.mil
MARCOLOGCOM NSN Assignment request mailbox:   smblogcomwsmcdmtrack@usmc.mil             
The U.S. Navy Weapon Systems Support manages the Parts Provisioning and Cataloging.
NAVSUP Weapon Systems Support - (Philadelphia / Mechanicsburg) – NAVSUP P-485
  https://www.navsup.navy.mil/NAVSUP-Enterprise/NAVSUP-Weapon-Systems-Support/
Global Distance Support Center (GDSC) -   https://www.navsup.navy.mil/Products-Services/Global-Distance-Support-Center/
Toll Free: 1-877-4-1-TOUCH (1-877-418-6824) - DSN: 510-428-6824
E-mail: gdsc@navy.mil          
Air Force (AF) Processes for Requesting a New NSN and NSN Maintenance Action.
Submit the request via the Foundational Logistics Information Technology Enterprise System (FLITES) – AFMCMAN 23-103 Air Material Command - (HQ AFMC/A4/10/A4R))
Air Force Business Enterprise System (BES)  -   https://www.airforcebes.af.mil/ 
Email:   besstratcomm@us.af.mil / https://www.airforcebes.af.mil/Contact-Us/
U.S. Coast Guard (USCG) Parts Provisioning and Cataloging is under the USCG Logistics Centers.
Aviation Logistics Center
Surface Forces Logistics Center
Shore Infrastructure Logistics Center
  https://www.dcms.uscg.mil/Our-Organization/Assistant-Commandant-for-Engineering-Logistics-CG-4-/
DLA Vendor Opportunities and Forecasts:
DLA Customer Interaction Center (DLA CIC)
We’re here for you 24 hours a day, 7 days a week, including Government holidays.
‘One Call Resolution’
Toll Free:   1-877-352-2255
Defense Switched Network (DSN):   xx-877-352-2255
Email:   dlacontactcenter@dla.mil
Visit us at
https://www.dla.mil/HQ/LogisticsOperations/Services/FIC/
E-mail us at   customeroutreach@dla.mil for questions or additional interest in Brochures.