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

<speed_mod>

at <speed>

<direction>

at <hour-not_initial_zero> o clock

<assault_command>

<assault_command> at <speed>

<normalize_pvd_operation>

center terrain at standard scale

<location_prep>

at

<temporal_control_method>

<sp> at <time_point>

at <time_point>

<bearing_mod>

pointing at <point_loc>

<create_operation>

<point_name> is at <coordinates>

<on_order>

at my command

<temporal_control_method-final>

<sp> at <time_point>

at <time_point>