rain-repellent system

rain shower / rain shower precipitation

water-repellent

water-repellent grease

insect repellent

rain-erosion damage

recent rain

recording rain gauge

freezing rain

heavy rain

rain gauge

rain precipitation

rain-intensity gauge

shower of rain and snow

shower rain

torrential rain

rain clutter

Rain clutters over

rain return clutter

rain down shells on the enemy

rain cover

rain destruction on

rain down

radioactive rain

fire extinguishing system sprinkler system and fire alarm system

merchant ship communication system (mercomm system)

multiple launch rocket system (MLRS); multiple rocket launcher system

Air Force weapons system / AF weapon system

attitude-and-heading reference system / attitude and heading reference system (AHRS)

selective calling system, SELCAL system

Unmanned Aerial System / Uncrewed Aircraf System (UAS)

system of system common operating environment

active denial system