Clan Skill Fire Squad from lvl. 2 should add 15 crit. rate.
Even though the crit. rate changes when ether You have this skill or not, it's not by 15.
Test:
1) Have a character in a unit with Fire Squad Lv. 2+
2) Record Crit. Rate
3) Move character to a unit without Fire Squad Lv. 2+
4) Restart a character (for skills to reset)
5) Record Crit. Rate
Interestingly I got different results on a different characters
a) GK with Fist - Difference by 6 crit. rate
b) Warcryer with Pole - Difference by 9 crit. rate
