After attending the Medical Faculty of the Sam Ratulangi University for two years, she enlisted herself at the officers' conscription school in 1970.

[1] After graduating from the school, Hermanus joined the army as a member of the Adjutant General Corps.

She attended the Indonesian Army Command and General Staff College in 1993 and graduated the next year.

[1] On 27 May 1997, Hermanus was installed as the superintendent of the Women's Army Corps Education Center.

She was installed after the body's separation from the Indonesian Army Doctrine, Education and Training Development Command.