Site where Uncle Ho awarded the flag 'Loyal to the nation, filial to the people' to Tran Quoc Tuan Military School

Tran Quoc Tuan Military School was formerly the entire Hotel Sa – Le area (also known as the French Saint-Cyr Infantry and Artillery Military School), now located within the Son Tay Bus Station area. On April 17, 1946, following instructions from President Ho Chi Minh, the Ministry of National Defense issued a decree establishing a regular military school to train primary-level military officers for the army; he named it Tran Quoc Tuan Military School. This site had the honor of welcoming Uncle Ho three times. On May 26, 1946, he attended the opening ceremony of the first course and awarded the school the flag 'Loyal to the nation, filial to the people.'

Previously, the school campus comprised the entire current Son Tay Bus Station area extending to the Ai Mo – Son Loc junction, divided into zones: the administrative zone included two two-story villas with French-style architecture; the lecture hall and academy zone included one main building, a dining hall, and a sports field; the teachers' zone included small villas, serving as workplaces and residences for the school's teachers and staff.

After the first course ended, the school was destroyed by enemy aircraft bombing. Implementing the scorched-earth resistance policy, the school dismantled its barracks and evacuated elsewhere. Today, the Bus Station area no longer retains traces of the school; only a memorial stele erected later remains within an area of about 150 m2.

On April 19, 2007, the People's Committee of Ha Tay Province (former) ranked the revolutionary relic site where President Ho Chi Minh awarded the flag 'Loyal to the nation, filial to the people' to Tran Quoc Tuan Military School (now Army Officer School I) as a historical-cultural relic under Decision No. 672/QD-UBND and approved the protected zone of the relic comprising the entire Son Tay Bus Station area with a total area of 5,356.6 m2 (according to cadastral map sheet No. 10, surveyed in 2002, scale 1/1000).

On January 29, 2019, the Ministry of Culture, Sports and Tourism issued Decision No. 419/QD-BVHTTDL on the ranking as a national relic of the 'historical relic site where President Ho Chi Minh awarded the flag Loyal to the nation, filial to the people to Tran Quoc Tuan Military School on May 26, 1946.'