Question: The person who resigned before Robin Fontes assumed her current position served in the Army for how many years?

Related documents: [0]  [DOC] Michael Thomas "Mike" Flynn (born December 1958) is a retired United States Army Lieutenant General, who served in the Army for 33 years until 2014. Flynn's military career included a key role in shaping U.S. counterterrorism strategy and dismantling insurgent networks in Afghanistan and Iraq, and he was given numerous combat arms, conventional, and special operations senior intelligence assignments. He was appointed by President Barack Obama as the eighteenth director of the Defense Intelligence Agency, serving from July 2012 to his retirement from the military in August 2014. After leaving the military, he established Flynn Intel Group which has provided intelligence services for businesses and governments, including ones in Turkey. Flynn also briefly served as the twenty-fifth National Security Advisor for President Donald Trump, from January 20 to February 13, 2017. [END] 
[1]  [DOC] Robin L. Fontes is a United States Army major general. In July 2017 she took command of Combined Security Transition Command – Afghanistan, becoming the highest-ranking female military officer in Afghanistan since the American invasion of that country in 2001. A mustang officer, Fontes was commissioned in 1986 and focused on Central Asia, eventually serving in Tajikistan, Pakistan, and India, including a few years in Afghanistan. She assumed her current position after the resignation of Michael Flynn from the Trump Administration ended her announced role as senior director for India, Pakistan and Central Asian Affairs on the United States National Security Council. [END]  
Answer: 33
33