[2] During the Indonesian National Revolution, he started off in 1945 as a second lieutenant in the 4th Division (today Kodam IV/Diponegoro), and became a treasurer for a regiment within it.

[4] Soedjono also undertook a 10-month course in the United States Army Financial Management School at Fort Benjamin Harrison, completing it in 1964.

The following year, industrialist Yutaka Kubota visited him to lobby for the resumption of the development of an aluminum plant at Asahan.

[9] With his new title, Soedjono continued engaging with Japanese investors (becoming a subject of student demonstrations in 1972 due to his involvement in the matter), lobbying for loans and investments almost exclusively outside formal diplomatic methods.

[10] Additionally, a recommendation from Soedjono was considered essential for local entrepreneurs seeking to establish ties with Japanese companies.

[6] In 1971, Soedjono, alongside Ali Murtopo, backed the founding of the Centre for Strategic and International Studies.

[8] Soedjono's well-known position as the conduit for Japanese investors became target of student protesters, who on 15 January 1974 rioted in what became known as the Malari incident.