http://www.washingtonpost.com/politi...y.html?hpid=z1 When President Obama makes his first extended trip to sub-Saharan Africa this month, the federal agencies charged with keeping him safe won’t be taking any chances.Hundreds of U.S. Secret Service agents will be dispatched to secure facilities in Senegal, South Africa and Tanzania. A Navy aircraft carrier or amphibious ship, with a fully staffed medical trauma center, will be stationed offshore in case of an emergency. Military cargo planes will airlift in 56 support vehicles, including 14 limousines and three trucks loaded with sheets of bulletproof glass to cover the windows of the hotels where the first family will stay. Fighter jets will fly in shifts, giving 24-hour coverage over the president’s airspace, so they can intervene quickly if an errant plane gets too close. The president and first lady had also planned to take a Tanzanian safari as part of the trip, which would have required the president’s special counterassault team to carry sniper rifles with high-caliber rounds that could neutralize cheetahs, lions or other animals if they became a threat, according to the planning document. But the White House canceled the safari Wednesday after inquiries from The Post about the trip’s purpose and expense, according to a person familiar with the decision.