Another word for mission critical

We have lost valuable talent from almost every base and every occupational specialty, including mission-critical linguists and infantry men.

Computacenter delivered this mission-critical managed service by using existing dedicated facilities, such as its Service Operation Center, and providing support staff on-site.

For a program which performs a ' mission critical ' task for the organization using it the rationale must be sufficiently thorough.

Any organization who: Must ensure maximum uptime for its mission critical systems.