adult
aerodrome
airdrome
airfield
airport
animal
bag
baggage
border
breed
canine
cargo
contraband
criminal
customs
detection
dog
drugs
duty
german shepherd
guard
handler
illegal
inspection
luggage
male
mammal
man
military
narcotics
officer
outdoors
patrol
pedigreed
pet
police
protect
purebred
safety
search
security
service
sniffer
suitcase
trained
transport
transportation
travel
unit
worker