Explanation:

• The Indian Navy participated in the U.S. Navy-led Southeast Asia Cooperation and Training (SEACAT) military exercise in Singapore, to demonstrate its maritime manoeuvres. 
• The main objective of SEACAT 2021 was to enhance the interoperability and shared maritime security concerns and preserve rules-based international order. The exercise comprised approximately 400 personnel and 10 ships.
• The 20th edition of the exercise was organised by the U.S. Navy, in Hybrid format, and included 20 other partner nations from the Indo-Pacific region, including India. Other countries participating in the exercise include Australia, Bangladesh, Brunei, Canada, France, Germany, Indonesia, Japan, Malaysia, Maldives, New Zealand, Philippines, South Korea, Singapore, Sri Lanka, Thailand, Timor-Leste, United Kingdom and Vietnam.

About the SEACAT:

• SEACAT was held for the first time in 2002. The exercise aims to foster enhanced cooperation between Southeast Asian countries by incorporating standardized training, tactics and procedures when faced with crises, contingencies or illegal activities in the maritime domain.