Bob Breen’s experience in first-hand research on international and regional peace support operations began in Somalia in 1993 and continued in Rwanda, the Middle East, Mozambique, Bougainville and East Timor periodically until 2002 when he began a PhD program at ANU, graduating in 2006. In 2007 he visited Iraq and Afghanistan as part of a review of Australian military force projection. In 2008 he published Struggling for Self Reliance: Four case studies of Australian Regional Force Projection in the late 1980s and the 1990s. In the same year he also co-authored a monograph for the Land Warfare Studies Centre, The world looking over their shoulders: Australian Strategic Corporals on Operations in Somalia and East Timor. He published two studies for the Australian Strategic Policy Institute on meeting security challenges in the South Pacific and strengthening civil-military collaboration for responding to overseas emergencies in 2009 .
Currently, he is writing a volume of the official history of Australian peacekeeping in the South Pacific 1980-2006 and completing a manuscript on the Adaptive Army initiative 2007-2010.