| Acronym | Meaning |
 | ISPE | Improved Sonar Processing Equipment (ssbn) |
| ISPW | International Software Process Working Group |
| ISSI | International Software Systems Incorporated |
| ISST | Infrared Surveillance Of Surface Targets |
| ITCS | Integrated Target Control System |
| ITF | Integration Test Folder |
| ITL | Integrated Test Lines |
| ITO | Identifying Technical Order |
| ITRO | Interservice Training Review Organization |
| ITS | Interim Trainer Support |
| ITSC | Interservice/industry Training Systems Conference |
| ITSS | Integrated Tactical Surveillance System |
| IU | Interface Unit |
| IUH | Instructor Utilization Handbook |
| IUS | Interim (inertial) Upper Stage |
| IUSS | Integrated Undersea Surveillance System |
| IV&V | Independent Verification And Validation |
| IX | Unclassified Miscellaneous Ships |
| J&A | Justification & Approval |
| J-MASS | Joint-modeling And Simulation System |
| J/S | Jam-to-signal |
| JASS | V-22 (jvx) Applications & Systems Software |
| JC | Jump Commander |
| JCMDR | Jump Commander |
| JCS | Joint Chiefs Of Staff |
| JETT | Jettison |
| JFET | Junction Field Effect Transistor |
| JILSP | Joint Integrated Logistic Support Plan |
| JINTACCS | Joint Interoperability Of Tactical Command And Control System |
| JLC | Joint Logistics Commanders |
| JMASS | Joint-modeling And Simulation System |
| JON | Job Order Number |
| JPATS | Joint Primary Aircraft Training System |
| JPTDS | Junior Participating Tactical Data System |
| JQR | Job Qualification Requirement |
| JRMB | Joint Requirements And Management Board |
| JSIL | Jvx System Integration Laboratory |
| JSOR | Joint Services Operations Requirements |
| JSRB | Joint Software Review Board |
| JSSS | Jvx (v-22) Simulation Support Software |
| JTFEX | Joint Task Force Exercise |
| JTIDS | Joint Tactical Information Distribution System |
| JTMS | Jvx (v-22) Test And Maintenance Software |
| JTSS | Jvx (v-22) Test Support Software |
| JUSTIS | Joint Uniform Services Technical Information System |
| JVX | Joint Services Vertical Lift Aircraft Experimental |
| KCAS | Knots Calibrated Airspeed |
| KDSI | Thousands Of Delivered Source Instructions |
| KHZ | Kilohertz |
| KI | Knowledge Information |
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