Question: What branch of military was the governor, who Sarah Steelman is currently serving, part of?
Context: Eric Robert Greitens (born April 10, 1974) is an American politician, author, and former Navy SEAL currently serving as the 56th Governor of Missouri, since January 2017.  He is currently the second youngest Governor in the United States, after New Hampshire's Chris Sununu. Anthony Gregory Brown (born November 21, 1961) is an American lawyer and politician, who is currently serving as the U.S. Representative for Maryland's 4th congressional district.  He previously served as the eighth Lieutenant Governor of Maryland, from 2007 to 2015.  He was elected as lieutenant governor in 2006 on the Democratic ticket with Governor Martin O’Malley, and both were reelected in 2010.  In 2014 he ran unsuccessfully for Governor of Maryland, losing to Larry Hogan.  Brown previously served two four-year terms in the Maryland House of Delegates, representing Prince George's County.  He is currently a Colonel in the United States Army Reserve, having served in the U.S. Army for nearly thirty years.  While lieutenant governor, Brown was one of the two highest-ranking elected officials in the nation to have served a tour of duty in Iraq. Catholic War Veterans (officially called the Catholic War Veterans of the United States of America) is a national service organization of baptized Catholics that have served or are currently serving in the United States Armed Forces.  Founded in 1935, the Catholic War Veterans are dedicated to serving all service members regardless and their families regardless of their religion.  Membership in the Catholic War Veterans is open to baptized Catholics, male or female, who have served on Active Duty for a period of at least 90 days, in the reserve component, or National Guard, or are currently on active duty in any branch of the military, specific war time service is not required. Sarah Steelman (born Sarah Hearne; May 3, 1958) is an American Republican politician from Missouri and State Treasurer from 2005 to 2009.  She is currently serving in the Office of Administration in Gov. Eric Greitens’ administration.  She did not run for re-election as state treasurer in 2008, having run for Governor, and was succeeded in office by Democrat Clint Zweifel on January 12, 2009.  She was listed in a 2008 article in the "New York Times" as among seventeen women who may someday run for President of the United States.  On November 29, 2010, Steelman announced she would run for the U.S. Senate in 2012.  She was defeated in the Republican primary by U.S. Representative Todd Akin. Jason Gonzalez (born September 30, 1973) is an attorney in Tallahassee, Florida.  He is credited with reshaping the Florida Supreme Court while serving as General Counsel to the Governor of Florida.  He was the chief advisor to the Governor on the appointment of four of the seven Justices currently serving on the Florida Supreme Court.  He handles civil and administrative litigation, appeals, and government affairs. Michael C. Thompson is a United States politician currently serving as the Oklahoma Secretary of Safety and Security.  Thompson is a brigadier general with the Oklahoma National Guard, currently serving as the assistant adjutant general.  Concurrent to his service as cabinet secretary, Thompson serves as the commissioner of the Oklahoma Department of Public Safety.  In this capacity, Thompson commands the Oklahoma Highway Patrol.  As secretary, Thompson is a member of the Oklahoma Governor's Cabinet and is responsible for directing all state public safety and corrections agencies. Lucile M. Jones (born 1955) is a seismologist and public voice for earthquake science and earthquake safety in California.  She has been with the US Geological Survey and a Visiting Research Associate at the Seismological Laboratory of Caltech since 1983.  She is currently serving as the Science Advisor for Risk Reduction for the USGS Natural Hazards Mission Area as part of the SAFRR Project.  In January 2014, she entered into a partnership on behalf of the USGS with the City of Los Angeles to serve as Seismic Risk Advisor to Mayor Eric Garcetti.  She served as a Commissioner of the California Seismic Safety Commission (CSSC), which advises the governor and legislature on seismic safety, by appointment of Governor Gray Davis in 2002 and reappointment by Governor Arnold Schwarzenegger in 2005 and serves on the California Earthquake Prediction Evaluation Council.  She has received several awards, including the Alquist Award from the California Earthquake Safety Foundation, the Shoemaker Award for Lifetime Achievements in Science Communication from the USGS, and the 2007 Award of Merit from the Los Angeles County Emergency Preparedness Commission. Clint Zweifel (born November 3, 1973), is an American politician from Missouri who served as the State Treasurer of Missouri from 2009 to 2017.  He succeeded Republican Sarah Steelman.  He is a member of the Democratic Party. Ahmadullah Alizai (born 1972) is a politician in Afghanistan, currently serving as the Advisor Minister of President in Local Governnance and have worked as the governor of Badghis & the Governor of Kabul Province in Afghanistan.  He previously served as the deputy governor of Kabul Province, deputy governor of Nangarhar Province, and as director of Counter-Narcotic directorate for the south-west zone. The National League for Democracy (Burmese: အမျိုးသား ဒီမိုကရေစီ အဖွဲ့ချုပ် , ] ; abbreviated NLD) is a democratic socialist and liberal democratic political party in Myanmar (Burma), currently serving as the governing party.  Founded on 27 September 1988, it has become one of the most influential parties in Myanmar's pro-democracy movement.  Special Honorary President of the Socialist International and Nobel Peace Prize laureate Aung San Suu Kyi serves as its President and she is currently serving as State Counsellor of Myanmar.  The party won a substantial parliamentary majority in the 1990 Burmese general election.  However, the ruling military junta refused to recognise the result.  On 6 May 2010, the party was declared illegal and ordered to be disbanded by the junta after refusing to register for the elections slated for November 2010.  In November 2011, the NLD announced its intention to register as a political party to contend future elections and on 13 December 2011, Burma's Union Election Commission approved their application for registration.
Answer: Navy