Michael Wilkerson, a former Fiat Lux blogger, is currentlyon a Fulbright in Uganda and wrote a dispatch for Foreignpolicy.com explaining the brutal  recent terrorist attacks in Kampala:

It’s clear why al-Shabab would have picked Uganda: It is the largest supplier of peacekeepers in the African Union Mission in Somalia(AMISOM), sharing with Burundi the burden of defending Somalia’s weak Transitional Federal Government (TFG). In recent months, al-Shabab has publicly threatened to attack Uganda and Burundi for defending the fledgling Mogadishu-based government, and most analysts agree that without the African Union troops, al-Shabab could quickly capture control of the capital.