The second annual workshop on Naval Applications of Machine Learning (NAML) was held February 13-15, 2018, at the Space and Naval Warfare (SPAWAR) Systems Center Pacific (SSC Pacific), a U.S. Navy research laboratory in San Diego, California, USA. The workshop events included invited speakers, demonstrations, discussion sessions, and oral and poster presentations. The workshop cochairs were Josh Harguess and Katie Rainey, both from SSC Pacific. The poster presentations were coordinated by Chris Ward also from SSC Pacific. This article discusses the motivation, goals, and impact of the workshop and highlights some of the topics covered.