Initial Operational Capability 

Type - Term
Description: Defined in JCS Pub 1-02 as the first attainment of the capability to employ effectively a weapon, item of equipment or system of approved specific characteristics, and which is manned and operated by an adequately trained, equipped and supported military force or unit. IOC is defined slightly differently by each military department but with comparable meaning. 
Acronym: IOC
 
Comments: Enterprise Transition Plan Glossary