Which group was crucial for aiding communication in the pacific theater

The joint-assault signal company, a unique Signal Corps unit, was born in the Pacific theater in late 1943.

Judicial review gives the supreme court the power to check over laws and and actions from Congress and the President to determine whether they are constitutional .

Explanation:

This is part of the checks and balances that the three branches of the federal government use in order to limit each other and ensure a balance of power.