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

<battalion_echelon>

ahb field train

attack helicopter battalion field train

fa battalion field train

fa battalion field trains cp

field artillery battalion field train

field artillery battalion field trains cp

task force field train

tf field train

<minefield>

claymore field

field of claymores

<css_section_echelon>

task force field trains cp

tf field trains cp