Currently they are used for lower cost persistent air surveillance (and I believe that use is due to expand). read more
They are both used as high (15,000 feet) mounts for ground surveillance cameras and other sensors (including radar for spotting moving targets on the ground) and are being put into place around some locations with a top-down radar that will allow them to more easily spot possible incoming cruise missiles. read more
In modern common usage, the terms zeppelin, dirigible and airship are used interchangeably for any type of rigid airship, with the term blimp alone used to describe nonrigid airships. Although the blimp also qualifies as a "dirigible", the term is seldom used with blimps. read more
Airships for Civil and Military Uses Mention airships to most people, and it will conjure up two images –either that of the little Goodyear blimps used for advertising, or that of the Hindenberg or R101 in flames. read more