US Secretary of Defense Mattis visits Djibouti

US Defence Secretary James Mattis prepares to shake hands with an airman prior to boarding a US Air Force C-17 plane en route to visit a US military base in Djibouti, in the Qatari capital Doha on April 23, 2017. PHOTO | AFP

What you need to know:

  • Camp Lemonnier, home to some 4,000 US soldiers and contractors, is vital to US military operations in Somalia against militant groups like Al-Shabaab, and also provides support for US operations in Yemen, where special forces regularly carry out drone strikes against Al-Qaeda in the Arabian Peninsula.