Gregg Berhalter says he 'll wrap up his playing career at season 's end .
Gregg Berhalter 's veteran leadership and experience was pivotal in Bruce Arena 's remaking of the Galaxy 's backline .
Gregg Berhalter , whose veteran leadership and experience was pivotal in Bruce Arena 's remaking of the Galaxy 's backline , says he 'll wrap up his playing career at season 's end .