Explanation :

• The Indian Air Force (IAF) and Royal Air Force (RAF) of United Kingdom, jointly commenced the fifth edition of Ex Indradhanush at Air Force Station Hindan on 24^thFebruary,2020.
• The focus of this edition of the exercise is 'Base Defence and Force Protection'.
• This theme is of significance considering the recent threats to military establishments from terror elements.
• The exercise started in 2006 and has held four editions so far.
• Ex Indradhanush provides a platform for the IAF and RAF to share and jointly validate strategies and tactics to counter terror threats to their installations.