The rules that use the vocabulary item "brdm2" are:

<i_f_v-sing>

brdm2

brdm2 recon

brdm2 reconnaissance

<i_f_v-pl>

brdm2 reconnaissances

brdm2 recons

<i_f_v>

brdm2

brdm2 recon

brdm2 reconnaissance

brdm2 reconnaissances

brdm2 recons