This is taken from the blog Hirhurim i cant phrase it better “av Tzvi Yehuda Kook was a major force and proponent for shaving in honor of the day and Rabbi Shlomo Aviner calls it a great mitzva worthy of ignoring the instructions and preferences of one’s parents.[3] Even Rav Tzvi Pesach Frank was said to have permitted shaving on Yom Ha’atzmaut.[4] There are also a number of precedents for individuals and even entire communities to take a haircut and shave on the anniversary on which a great miracle had occurred, even if it is during the omer period.[5]
It is reported that Rav Kook was once asked what the halacha is with regards to shaving on Yom Ha’atzmaut and his response was that he would examine their faces on Yom Ha’atzmaut for the answer. When he saw that many of his students did not shave in honor of the day he labeled them with the verse: “Their faces show their character”,[6] as if to say that the disheveled look on their faces from not shaving shows that they did not understand or appreciate the great spiritual significance of Yom Ha’atzmaut. As he put it: “When there is faith, there is joy and when there is joy there are no halachic doubts”.[7]”
I hope that answers your question, once again im not sating i agree im saying that rabbis hold differently so you have to ask your personal rabbi about this.