In February 2012, President Ellen Johnson Sirleaf, a month after being sworn in on her re-election as
Liberian president, nominated Joseph F. Johnson as Deputy Minister of Defense. Johnson assumed this office in March 2012. Johnson served as the Deputy Minister for Administration at the
Ministry of National Defense. He was responsible for administrative oversight and institutional management. On 14 March 2014, Johnson was reinstated back to the position. President Sirleaf in her reinstatement letter said that he was cleared of all allegations following an investigation into the situation which led to his suspension. In 2014, Johnson welcomed the
101st Airborne Division of the
US Army support in
Liberia's effort to combat Ebola virus. In 2015, he saw off, at the
Roberts International Airport, military personnel from the
Armed Forces of Liberia to
Mali for peacekeeping efforts in the
Mali War. He left office as Deputy Minister of Defense on the expiration of the term of presidential office of President Sirleaf. ==Ambassador to Morocco (2025 to present)==