<Tr> <Td> </Td> <Td> RADM Earl E. Stone </Td> <Td> USN </Td> <Td> 1949--1951 </Td> <Td> Harry S. Truman </Td> </Tr> <Tr> <Td> </Td> <Td> MG Ralph Canine </Td> <Td> USA </Td> <Td> 1951--1952 </Td> <Td> Harry S. Truman </Td> </Tr> <Table> <Tr> <Th> #</Th> <Th> Director </Th> <Th> Photo </Th> <Th> Service </Th> <Th> Term </Th> <Th> President (s) served under </Th> </Tr> <Tr> <Td> </Td> <Td> MG Ralph Canine </Td> <Td> </Td> <Td> USA </Td> <Td> 1952--1956 </Td> <Td> Harry S. Truman Dwight D. Eisenhower </Td> </Tr> <Tr> <Td> </Td> <Td> Lt Gen John Samford </Td> <Td> </Td> <Td> USAF </Td> <Td> 1956--1960 </Td> <Td> Dwight D. Eisenhower </Td> </Tr> <Tr> <Td> </Td> <Td> VADM Laurence Frost </Td> <Td> </Td> <Td> USN </Td> <Td> 1960--1962 </Td> <Td> Dwight D. Eisenhower John F. Kennedy </Td> </Tr> <Tr> <Td> </Td> <Td> Lt Gen Gordon Blake </Td> <Td> </Td> <Td> USAF </Td> <Td> 1962--1965 </Td> <Td> John F. Kennedy Lyndon B. Johnson </Td> </Tr> <Tr> <Td> </Td> <Td> LTG Marshall Carter </Td> <Td> </Td> <Td> USA </Td> <Td> 1965--1969 </Td> <Td> Lyndon B. Johnson Richard Nixon </Td> </Tr> <Tr> <Td> 6 </Td> <Td> VADM Noel Gayler </Td> <Td> </Td> <Td> USN </Td> <Td> 1969--1972 </Td> <Td> Richard Nixon </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Lt Gen Samuel C. Phillips </Td> <Td> </Td> <Td> USAF </Td> <Td> 1972--1973 </Td> <Td> Richard Nixon </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Lt Gen Lew Allen </Td> <Td> </Td> <Td> USAF </Td> <Td> 1973--1977 </Td> <Td> Richard Nixon Gerald Ford Jimmy Carter </Td> </Tr> <Tr> <Td> 9 </Td> <Td> VADM Bobby Ray Inman </Td> <Td> </Td> <Td> USN </Td> <Td> 1977--1981 </Td> <Td> Jimmy Carter Ronald Reagan </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Lt Gen Lincoln Faurer </Td> <Td> </Td> <Td> USAF </Td> <Td> 1981--1985 </Td> <Td> Ronald Reagan </Td> </Tr> <Tr> <Td> 11 </Td> <Td> LTG William Odom </Td> <Td> </Td> <Td> USA </Td> <Td> 1985--1988 </Td> <Td> Ronald Reagan </Td> </Tr> <Tr> <Td> 12 </Td> <Td> VADM William Studeman </Td> <Td> </Td> <Td> USN </Td> <Td> 1988--1992 </Td> <Td> Ronald Reagan George H.W. Bush </Td> </Tr> <Tr> <Td> 13 </Td> <Td> VADM John M. McConnell </Td> <Td> </Td> <Td> USN </Td> <Td> 1992--1996 </Td> <Td> George H.W. Bush Bill Clinton </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Lt Gen Kenneth A. Minihan </Td> <Td> </Td> <Td> USAF </Td> <Td> 1996--1999 </Td> <Td> Bill Clinton </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Lt Gen Michael Hayden </Td> <Td> </Td> <Td> USAF </Td> <Td> 1999--2005 </Td> <Td> Bill Clinton George W. Bush </Td> </Tr> <Tr> <Td> 16 </Td> <Td> LTG / GEN Keith B. Alexander </Td> <Td> </Td> <Td> USA </Td> <Td> August 1, 2005--March 28, 2014 </Td> <Td> George W. Bush Barack Obama </Td> </Tr> <Tr> <Td> 17 </Td> <Td> ADM Michael S. Rogers </Td> <Td> </Td> <Td> USN </Td> <Td> April 2, 2014--present </Td> <Td> Barack Obama Donald Trump </Td> </Tr> </Table> <Tr> <Th> #</Th> <Th> Director </Th> <Th> Photo </Th> <Th> Service </Th> <Th> Term </Th> <Th> President (s) served under </Th> </Tr>

Who is the head of the national security agency