His experiences in the East African Posts and Telecommunications Administration provided him with valuable insight and skills that would later shape his political career.

Despite facing challenges within the government, Muwanga's resilience and political acumen allowed him to navigate through turbulent times.

He became the head of a six-man Military Commission, which acted as the de facto president of Uganda for a short period.

Later, Muwanga chaired the Presidential Commission of Uganda from May 22 to December 15, 1980, assuming the powers of the president during this transitional phase.

He assumed the role of the head of the Electoral Commission and declared the Uganda People's Congress, led by Milton Obote, as the winner.