Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Object Groupings and Systems (hierarchy name)
4. object groupings
5. [object groupings by specific context]
6. vehicle groupings

Anotations

Scope note:

Use both for groups of merchant or naval auxilliary ships traveling under armed escort and for groups of motor vehicles organized for the purpose of control and orderly movement, with or without escort protection.