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

<bearing_range>

pigeons to <reference_point> <bearing_spec-three_dig> <range>

<in_or_out-transitive>

to enter

to exit

<altitude_direction_verb>

climb to

descend to

<controller_flight_advisory>

cleared to engage

cleared to fire

cleared to join

cleared to region

cleared to switch

ready to copy

return to base

stand by to copy nine line

stand by to copy nine line brief

<controller_flight_advisory-proceed_as_briefed>

cleared to switch

<in_or_out-not_transitive>

to enter

to exit

<scale_operation-gapsout_null-gapsin_np_gap>

set scale to

<controller_flight_advisory-not_recursive-adj>

cleared to engage

cleared to fire

cleared to join

cleared to region

cleared to switch

<h_hour>

time to target

<controller_flight_advisory-recursive-proceed_as_briefed>

cleared to switch

<aux-vform_inf-vform_subcat_base>

to

<direction_prep>

direct to

to

<comp-not_pro-base>

in order to let

<change_grammar_operation>

<set_attribute> grammar to <grammar>

<set_attribute> to <grammar> grammar

<controller_flight_advisory-not_recursive-adj-proceed_as_briefed>

cleared to switch

<assign_prefix>

assigned to

<h_hour-time_to_target>

time to target

<line_mod-gapsout_null-gapsin_null>

from <coordinates> to <coordinates>

from <here_there_location> to <here_there_location>

<purpose_connective>

to

<scale_operation-gapsout_null-gapsin_null>

<change_parameter> scale to one over <scale_number-gapsout_null-gapsin_null>

<change_parameter> scale to one to <scale_number-gapsout_null-gapsin_null>

set scale to <scale_number-gapsout_null-gapsin_null>

set scale to one over <scale_number-gapsout_null-gapsin_null>

set scale to one to <scale_number-gapsout_null-gapsin_null>

<next_phase_command>

<proceed_verb> to next <phase_noun>

to next <phase_noun>

<communications_directive>

<radio_contact_verb> <controller> on <frequency_code> prior to <point_name>

<to_prep>

to