+ to use when killing a service. This
+ controls the signal that is sent as
+ first step of shutting down a unit
+ (see above), and is usually followed
+ by <constant>SIGKILL</constant> (see
+ above and below). For a list of valid
+ signals, see
+ <citerefentry><refentrytitle>signal</refentrytitle><manvolnum>7</manvolnum></citerefentry>. Defaults
+ to <constant>SIGTERM</constant>.