The database is arranged as a hierarchy. For example, the value of a Level-3 equipment category is equal to the sum of its Level-4 subcategories.  A category's level can be determined by the number of non-zero digits.  For example RADAR (551000) is a Level-3 category.

5-5-0-0-0-0 GOVERNMENT/MILITARY

5-5-1-0-0-0 RADAR

5-5-1-1-0-0 SEARCH & DETECTION

5-5-1-1-1-0 AIRBORNE

5-5-1-1-2-0 MARINE

5-5-1-1-3-0 GROUND

5-5-1-2-0-0 TRACKING

5-5-1-2-1-0 AIRBORNE

5-5-1-2-2-0 MARINE

5-5-1-2-3-0 GROUND

5-5-1-3-0-0 INSTRUMENTATION RADAR

5-5-1-3-1-0 AIRBORNE/SPACE BORNE/SHIP

5-5-1-3-2-0 GROUND

5-5-1-4-0-0 CHECKOUT & SUPPORT

5-5-1-9-0-0 OTHER RADAR

5-5-2-0-0-0 GUIDANCE/CONTROL

5-5-2-1-0-0 MISSILE & SPACE

5-5-2-2-0-0 AIRBORNE/MARINE/GROUND

5-5-2-3-0-0 CHECKOUT & SUPPORT

5-5-2-9-0-0 OTHER GUIDANCE/CONTROL

5-5-3-0-0-0 COMMUNICATION & NAVIGATION

5-5-3-1-0-0 COMMUNICATION

5-5-3-1-1-0 TELECOMMUNICATIONS

5-5-3-1-2-0 RADIO COMM

5-5-3-1-3-0 MICROWAVE

5-5-3-1-4-0 CHECKOUT & SUPPORT

5-5-3-1-9-0 OTHER COMMUNICATION

5-5-3-2-0-0 NAVIGATION

5-5-3-2-1-0 AIRBORNE

5-5-3-2-2-0 SURFACE/MARINE/GROUND

5-5-3-2-3-0 UNDERWATER

5-5-3-2-4-0 CHECKOUT & SUPPORT

5-5-4-0-0-0 ELECTRONIC WARFARE

5-5-4-1-0-0 JAMMER

5-5-4-2-0-0 ELINT RECEIVER

5-5-4-3-0-0 WARNING RECEIVER

5-5-4-4-0-0 MULTIFUNCTION

5-5-4-5-0-0 CHECKOUT & SUPPORT

5-5-4-9-0-0 OTHER ELECTRONIC WARFARE

5-5-5-0-0-0 SIMULATION AND TRAINING

5-5-6-0-0-0 COMPUTER EQUIPMENT

5-5-7-0-0-0 ELECTRO-OPTIC

5-5-8-0-0-0 SONAR SYSTEMS

5-5-8-1-0-0 AIRBORNE

5-5-8-2-0-0 SURFACE

5-5-8-3-0-0 SUBMARINE

5-5-8-4-0-0 CHECKOUT & SUPPORT

5-5-9-0-0-0 OTHER MILITARY ELECTRONICS

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