He then spent a period on secondment with the French Navy from September 1991 to June 1992, serving as navigation officer aboard the helicopter carrier Jeanne d'Arc.

Kaack then undertook admiral staff training at the Military Academy of the German Armed Forces at Hamburg from October 1997 to September 1999, before becoming first officer of the destroyer Mölders the following month.

[1] Kaack served as commander of the Bayern until June 2004, before taking up an appointment as Deputy Head of the Armed Forces Staff at the Federal Ministry of Defence.

After the completion of this service in June 2006, he began a one-year postgraduate degree at the US Naval War College, Newport, Rhode Island.

This posting lasted until September 2012, and the following month Kaack became Head of the Military Policy and Operations Unit (Sub-Saharan Africa, America, Arctic) at the Federal Ministry of Defence.