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

<assault_command>

<assault_command> <duration_mod>

<suppressive_fire_command>

<suppressive_fire_command> <duration_mod>

<move_mod-gapsout_pp_gap-gapsin_pp_gap-not_compass_direction>

<duration_mod>

<halt_command>

<halt_verb> <duration_mod>

<move_mod-gapsout_null-gapsin_null-not_compass_direction>

<duration_mod>

<move_mod-gapsout_np_gap-gapsin_np_gap-not_compass_direction>

<duration_mod>