Answer:
An attache' usually has a specialty that he/she is well versed in: millitray, immigration, science, medical, evacuations, etc. They are assigned to Ambassadors, Consul Generals, or Embassy Missions around the globe. What do they do? This really depends on the needs of the particular Embassy, Ambassador, or Consul General. They may write speeches, plan for medical evacuations or natural disasters, advise on immigration issues, or create plans for installing roads. In other words, there is no set of skills in which to clarify the position, but the position covers just about every profession that you can imagine.