Yar'Adua started his military career as a soldier after graduating from the
Nigerian Military School in 1981, he rose to the rank of Lance Corporal. He was granted Short Service Combatant Commission to the rank of
second lieutenant on 22 September 1990. He later converted to Regular Combatant Commission on 16 March 1998. Yar'Adua served in the Nigerian Army Signals Corps. He attended several civil and military courses, seminars and workshops, some of which include Signals Young Officers Course, Infantry Young Officers Course, Junior Staff Course Harris Corporation Technical Training on RF HF and VHF Radios, Training on Satellite Communications, Management Training Course, Spectrum Management Training, Peace Keeping, Force Protection and Antiterrorism Training. He also held several military appointments ranging from staff, instruction to command positions. His last appointment was as Assistant Director of Records, Army Headquarters Abuja. He retired from service as a
lieutenant colonel on 30 September 2010, after 29 years of military service. ==Political career==