The rules that use the category "<unit_call_sign-gapsout_null-gapsin_null>" are:

<full_unit_call_sign>

<unit_call_sign-gapsout_null-gapsin_null>

<unit_name_mod>

<name_adj> <unit_call_sign-gapsout_null-gapsin_null>

<contact_command_mod>

<assign_prefix> <unit_call_sign-gapsout_null-gapsin_null>

<air_command_prefix-roger>

<roger> <unit_call_sign-gapsout_null-gapsin_null>

<roger> <unit_call_sign-gapsout_null-gapsin_null> <controller>

<unit_call_sign-gapsout_null-gapsin_null> <controller> <roger>

<unit_call_sign-gapsout_null-gapsin_null> <roger>

<unit_call_sign-gapsout_null-gapsin_null> <roger> <controller>

<air_command_prefix>

<roger> <unit_call_sign-gapsout_null-gapsin_null>

<roger> <unit_call_sign-gapsout_null-gapsin_null> <controller>

<unit_call_sign-gapsout_null-gapsin_null>

<unit_call_sign-gapsout_null-gapsin_null> <controller>

<unit_call_sign-gapsout_null-gapsin_null> <controller> <roger>

<unit_call_sign-gapsout_null-gapsin_null> <roger>

<unit_call_sign-gapsout_null-gapsin_null> <roger> <controller>