[1] Sirakov was born on 2 November 1895 in the village of Mirkovo, Pirdop region.
Asen Sirakov was a military attache in Budapest from 1935 to 1936 and in Berlin from 1936 to 1938.
During the period 1941–1944, he was commander of the 8th Tundzha Infantry Division in Stara Zagora, and from 14 May to 30 October 1944 of the II Bulgarian Occupation Corps in Belomorie.
He was tried by the People's Court, but did not receive a severe sentence due to the advocacy of members of the Military Union participating in the new regime.
From 1951 to 1954 he was head of the military department at the Agricultural Academy in Sofia.