Several weeks ago, Marines with the unit assigned to train friendly forces across African nations agreed to speak with me for a story describing how the Marine Corps’ mission there is evolving and growing as the U.S. withdraws forces from Afghanistan. The resulting story, published here, highlights the mission in Senegal, where a force composed primarily of reconnaissance Marines have mentored commandos on everything from riverine operations to swimming in treacherous water. During our interview, Maj. Thomas Waller, then the head of the team there, described an incident in June in which a Senegalese commando was badly injured while conducting…