On May 5, President Barack Obama hosted his Djiboutian counterpart, Ismail Omar Guelleh, at the White House. The two leaders signed a 20-year lease agreement for the Djibouti-based Camp Lemonnier, the biggest U.S. military base in Africa. Covering 500 acres, the installation is a crucial launching site for U.S. military operations against militant groups in the Horn of Africa and Yemen. The U.S. agreed to pay an annual fee of $70 million for the site, which now hosts more than 4,000 U.S. military personnel and civilians.

The base is a key part of Pentagon's plans "to maximize the impact of a relatively small U.S. presence in Africa," according to the 2014 Quadrennial Defense Review, a congressional panel that conducts assessments of U.S. defense strategy and priorities.