The rules that use the category "<vehicle_echelon>" are:

<vehicle_type-creatable-sing>

<vehicle_echelon>

<vehicle_type-num_all>

<vehicle_echelon>

<vehicle_type-not_creatable-num_all>

<vehicle_echelon>

<vehicle_type-not_creatable>

<vehicle_echelon>

<vehicle_type-sing>

<vehicle_echelon>

<vehicle_type-not_creatable-sing>

<vehicle_echelon>

<vehicle_type-pl>

<vehicle_echelon>

<vehicle_type-not_creatable-pl>

<vehicle_echelon>