The rules that use the vocabulary item "lcu" are:

<ship_class-creatable-sing>

lcu

<ship_class-not_creatable-sing>

lcu

<ship_name>

lcu one six six five

lcu one six six four

lcu one six six three

lcu sixteen sixty five

lcu sixteen sixty four

lcu sixteen sixty three

<ship_class-not_creatable>

lcu