Different RF bands are used in "aeronautical radio, navigation, broadcasting, and personal wireless communication services," according to EHS, while "specific frequencies are designated for industrial, scientific, and medical uses." Some reported hearing high-pitched sounds similar to crickets while at home or staying in hotels, leading to an early theory of a sonic attack. "However, as insecticides can increase the risk or severity of adverse outcomes after exposure to a wide variety of physical or psychosocial stressors, the committee cannot rule out subacute or chronic OP and/or pyrethroid exposures as a possible contributing factor to nonspecific chronic symptoms." The U.S. Embassy in Cuba is all but closed as a result of the illnesses, while diplomats experiencing similar symptoms stationed in China have had a hard time finding validation from the U.S. government. Most individuals reported that the sound or these other sensations seemed to originate from a particular direction and were perceived only when the individual was in a specific physical location.
Different ringing tones are used in "aeronautical radio, radi, and popularly. icsare stayed in a separate hospital.
( z0 multi-sentence :snt ( z1 use :ARG1 ( z2 volume :ARG1-of ( z3 differ ) :mod ( z4 ring ) ) :ARG2 ( z5 and :op ( z6 radio :mod ( z7 aeronautics ) ) :op ( z8 radiate ) :op ( z9 popular ) ) ) :snt ( z10 stay :ARG1 ( z11 product :name ( z12 name :op "movie" :op "peace" ) :mod ( z13 military :name ( z14 name ) ) ) :location ( z15 hospital :ARG1-of ( z16 separate ) ) ) )
(z0 / multi-sentence
    :snt1 (z1 / use-01
              :ARG1 (z2 / volume
                        :ARG1-of (z3 / differ-02)
                        :mod (z4 / ring-01))
              :ARG2 (z5 / and
                        :op1 (z6 / radio
                                 :mod (z7 / aeronautics))
                        :op2 (z8 / radiate-01)
                        :op3 (z9 / popular-02)))
    :snt2 (z10 / stay-01
               :ARG1 (z11 / product
                          :name (z12 / name
                                     :op1 "movie"
                                     :op2 "peace")
                          :mod (z13 / military
                                    :name (z14 / name)))
               :location (z15 / hospital
                              :ARG1-of (z16 / separate-02))))
Different ringing tones are used in " aeronautical radio , radi , and popularly . icsare stayed in a separate hospital .
z2 :mod z4
z2 :ARG1-of z3
z1 :ARG1 z2
z6 :mod z7
z5 :op1 z6
z1 :ARG2 z5
z5 :op2 z8
z5 :op3 z9
z0 :snt1 z1
z11 :name z12
z11 :mod z13
z13 :name z14
z12 :op1 0
z12 :op2 1
z10 :ARG1 z11
z0 :snt2 z10
z15 :ARG1-of z16
z10 :location z15