The rules that use the vocabulary item "57mm" are:

<i_f_v-sing>

57mm triple-a

opfor 57mm

swa 57mm

swa 57mm aamg

<i_f_v-pl>

57mm triple-as

swa 57mm aamgs

<i_f_v>

57mm triple-a

57mm triple-as

opfor 57mm

swa 57mm

swa 57mm aamg

swa 57mm aamgs