James G. Stavridis

Front-line officials, including DEA agents, border patrol and other homeland-security professionals, should remind Mr. Trump how important Mexico's assistance is in achieving his national-security goals.

I am a huge consumer of social networks, and I utilize Twitter, Facebook, and LinkedIn. I'm interested and am learning more about Tumblr and other visually dominant sites.

Thinklogical's systems play a key role in the delivery and visualization of mission critical data used every day by military and intelligence communities worldwide.

Russian strategy seems to center on maintaining Putin's popularity at home; building a strong military capacity in special forces, nuclear weapons, and advanced submarines; pressuring nearby nations to join various defense and customs pacts dominated by Russia; and pushing back on the U.S. wherever convenient.

I knew early I wanted to follow my father into the military. He did a full 30-year career and retired as a full colonel in the Marines after graduating from Allentown H.S. and later from Cornell University.

Building a stable, peaceful, and coherent Europe must include Russia.

In the 20th century, we built a lot of walls - we endlessly tried to build walls between us and people we perceived, correctly or incorrect, as our enemies. In the 21st century, because of the advent of networks, the free movement of goods and people across the globe, we need to build security by building bridges instead of building walls.

In the 21st century, we can't create security by building walls.

As a geographic location, Greece offers the best bases in the NATO Alliance from which to operate in the trouble spots of the Middle East and the Mediterranean.

During the early 1990s, Mexico's domestic political sensitivities meant that it rarely extradited people who had committed crimes in the U.S. After NAFTA, extradition numbers began to increase until they surpassed 100 a year in the late 2000s.

I grew up as a baseball player, and given my modest size, it was always clear that I would end up playing in the infield.

In any insurgency there will be people who are irreconcilable and who pose a clear and present threat to the U.S. and our allies.