By the 1990s the unit had been upgraded with MiG-31 jets.

Each individual unit can be upgraded, improving their armor or offensive capability.

From 15 August 2009, the unit was upgraded into an independent unit and took its present name.

As of June 2006, four generating units have been upgraded, and the project was on schedule for completion in August 2007.

On 1 March 1999, two academic units were upgraded as departments.

In February 1945, the unit was officially upgraded to a division and renamed 33.

Most units can be upgraded, making them better at certain tasks.

The unit was upgraded to a division on May 12, 1949.

In anticipation of this, the unit was upgraded to a division in 1981.

In-service units were generally upgraded to the D model in the field.