On Sunday, the first 50 men arrived, to later be joined by an additional 100 older recruits, according to the military IDF.
The conscripts constitute "a first step in establishing an ultra-orthodox brigade, a significant milestone in expanding the ultra-orthodox's efforts in IDF, particularly in light of the operational efforts required due to the war", the military writes on Telegram.
The 50 men who arrived on Sunday will, after training, be part of a special brigade, called the Hasmonean brigade.
According to The Times of Israel, they will, among other things, be allowed to wear religious clothing instead of uniforms on Saturdays, and have daily mandatory moments for prayer and Torah studies.
Israel began calling in ultra-orthodox men in November last year, an extremely controversial measure in the country.
They had until then been exempt from the military service that all other Israelis – men and women – must perform for several years. But as Israel's defense forces have become increasingly strained during the recent war, demands have grown for everyone to contribute.
Thousands of ultra-orthodox have protested against military service and many have ignored draft orders.