Y
Y azimuth
Y-coordinate
Y engine
Y formation
Y grid
Y-hour
Y intelligence
Y–junction
Y line
Y piece
Y service (Y-service) / Y-station
Y-shaped
Y-type foxhole
Y-Y-Line
Y – YANKEE
Yalla
Yankee
yard
yard stick
yard track
yardage line
yardage mark
yaw
yaw accelerometer
yaw angle
yaw control
yaw control system
yaw damper
yaw damping
yaw erection
yaw meter
yaw pedals
yaw program
yaw-rate gyro
yaw stability
yawing
yawing moment
yawn
yearling
years of the Thaw
yellow area
yellow cross shell
yeoman
yeoman of signals
yeoman (your experience, organization, management, administration needed)
yeomanry
yeoman's service
yet-to-be-completed warship
YF
yield
yield degradation
yield ground
yield oneself prisoner
yield point (YP)
yield strength (YS)
yield success
yoke
yoke portion of extractor
yoke trunnion
yomp
you are / I read you…
young inexperienced sailor
yowie suit
yperite; mustard gas
YPR-765