Yizkor for Israelis outside of Israel

Hi,

Israelis who are outside of Israel may go to shul and say Yizkor on the day that the community says it. They should appear to recite all of the prayers with those around them when in shul, lest they distinguish themselves from those around them.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 3:92)

Have a great day,
Mordechai