'/etc/rc.d/ntpd fetch' does not update /var/db/ntpd.leapseconds.list.  In looking at the file I have (on 10.3) vs. https://www.ietf.org/timezones/data/leap-seconds.list, it appears the the version number has gone backwards in the ietf.org version, but the expiry has moved forward.  This is probably harmless, but caused me some confusion as the file is now expired.

If I type

# service ntpd fetch
ntp_src_leapfile version is 3660508800
ntp_db_leapfile version is 3660508800
not replacing /var/db/ntpd.leap-seconds.list with /etc/ntp/leap-seconds
Within ntp leapfile expiry limit, initiating fetch
fetching https://www.ietf.org/timezones/data/leap-seconds.list
using existing /var/db/ntpd.leap-seconds.list

The version and expiry on the ietf site are:
#$	 3629404800
#@	3691872000

and for the file in /var/db (sourced from somewhere in the FreeBSD tree, I think, it has FreeBSD svn info in it):
#$       3660508800
#@      3673728000