Ivan A. Lopez

After three mass shootings at military bases in the U.S. over the last five years, security experts say the sad truth is that there is probably no practical way of preventing members of the armed forces or civilian employees from carrying guns onto big installations like the Army's Fort Hood in Texas.

After three mass shootings at military bases in the U.S. over the last five years, security experts say the sad truth is that there is probably no practical way of preventing members of the armed forces or civilian employees from carrying guns onto big installations like the Army's Fort Hood in Texas.