COMCASA gives India access to previously unseen defense access
COMCASA essentially ensures interoperability in military communication between the two countries.
According to ToI, this could effectively translate to secure communication devices being installed in defense equipment bought by India.
Additionally, COMCASA enables India to procure high-end spying equipment like armed surveillance drones, and also gives India access to secure US military communication links, such as Link 16, originally designed for NATO use.
It's worth noting that the US has similar agreements with Australia, Japan, and South Korea in the Indo-Pacific region, and the new agreement might pave the way for an 'Asian NATO' that could act as a bulwark against increasing Chinese presence in the region.
Earlier, China had questioned Indo-US agreements, and the possibility of an 'Asian NATO' is unlikely to sit well with Beijing.