What is the different between End Item Acronym Code (EIAC) and End Item Code (EIC)?
How do I obtain either code?
As per MIL-PRF-49506, Logistics Management Information, Appendix B, an End Item Acronym Code (EIAC) is a code which uniquely identifies the system/equipment the system/equipment end item. The code will be assigned by the requiring authority and will remain constant throughout the item’s life cycle (e.g., TOW, PATRIOT, Tomahawk, Sparrow, etc.). The MIL-PRF-49506 can be accessed via the following web address: http://www.everyspec.com/MIL-PRF/MIL-PRF-030000-79999/MIL_PRF_49506_63/
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In accordance with Army Regulation (AR) 700-138, Army Logistics Readiness and Sustainability, the End Item Code (EIC) is the data element that identifies specific Class VII end items (major end items such as launchers, tanks, mobile machine shops and vehicles). Further information regarding the EIC is contained on page 129 of the aforementioned reference and can be accessed via the following web address: http://www.apd.army.mil/pdffiles/r700_138.pdf
With regard to the second question – the code(s) are assigned by the applicable requiring authority. Per MIL-STD-1388-2B, DoD Requirements for a Logistics Support Analysis Record, a requiring authority is generally a government activity but may be a contractor when Logistics Support Analysis (LSA) documentation requirements are levied on subcontractors. A listing of requiring authorities is included within Appendix E of MIL-STD-1388-2B and can be accessed via the following web address: http://www.raytheoneagle.com/asent/downloads/MIL-STD-1388-2B Notice 1.pdf