Letâs start with military unmanned aircraft. According to the annual almanac published by the Air Force Association (http://www.airforcemag.com/Magaz...), as of mid-2016: MQ-1 Predators: 268 produced, 139 in service, 111 destroyed in accidents; MQ-9 Reapers: 346 (including those as yet undelivered), 165 in service, 24 destroyed in accidents
Secretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland.In contrast to excretion, the substance may have a certain function, rather than being a waste product.ecretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland.
1. The process of secreting a substance, especially one that is not a waste, from the blood or cells: secretion of hormones; secretion of milk by the mammary glands. 2. A substance, such as saliva, mucus, tears, bile, or a hormone, that is secreted.ecretion. 1  gall-As in gallbladder, it refers to a secretion of the liver or to bile. 2  honeyflow-The period of secretion of honey or nectar by flowers. 3  sepia-A cuttlefish, the origin of the brown pigment prepared from a secretion of the fish.