The RX-79BD-1 Blue Destiny Unit 1 is a variant of the RX-79[G] Gundam Ground Type introduced in Mobile Suit Gundam Side Story: The Blue Destiny and was piloted by Yuu Kajima.

The Blue Destiny Unit 1 was a modified RX-79[G] Gundam Ground Type, with improved generator output and enhanced mobility thanks to the use of magnet coating and added leg verniers. Weapons-wise, it had additional armament in the form of a pair of 60mm chest vulcans and a pair of wire-guided missile launchers on the stomach. It was also equipped with the same 100mm machine gun, beam sabers, and shield as the Gundam Ground Type.

The development of the Blue Destiny Unit 1 was led by Dr. Chlust Moses, a researcher from the Principality of Zeon's Flanagan Institute who defected to the Earth Federation, and incorporated the EXAM System, a unique mobile suit operating system that he invented. Originally, the Blue Destiny Unit 1 was based on the RGM-79[G] GM Ground Type. However, as its performance did not meet the demands of the EXAM System, the GM Ground Type's head, which was already installed with the EXAM System, was removed and mounted on a modified chassis based on the Gundam Ground Type.

The EXAM System was designed to draw out a mobile suit's full potential for a limited time. However, it was highly unstable, and prone to going berserk, attacking friends and foes alike. Federation mechanic Alph Kamra later installed a limiter on the Unit 1, limiting the EXAM System's output at 50% to prevent it from going berserk. The output can be raised to 100% when necessary, but this can only be sustained for 5 minutes before the machine overheats.