 The US government was aware of these activities in Cambodia , but refrained from taking overt military action within Cambodia in hopes of convincing the mercurial Sihanouk to alter his position . To accomplish this , President Lyndon B. Johnson authorized covert cross @-@ border reconnaissance operations conducted by the secret Studies and Observations Group in order to gather intelligence on PAVN / NLF activities in the border regions ( Project Vesuvius ) . This intelligence data would then be presented to the prince in an effort to change his mind . 
 The US government was aware of these activities in Cambodia , but refrained from taking overt military action within Cambodia in hopes of convincing the mercurial Sihanouk to alter his position . To accomplish this , President Lyndon B. Johnson authorized covert cross @-@ border reconnaissance operations conducted by the secret Studies and Observations Group in order to gather intelligence on PAVN / NLF activities in the border regions ( Project Vesuvius ) . This intelligence data would then be presented to the prince in an effort to change his mind . 
The US government was aware of dese activities in Cambodia , but refrained from takin overt military action within Cambodia in hopes of convincing da mercurial Sihanouk to alter his position . To accomplish this , President Lyndon B. Johnson authorized covert cross @-@ border reconnaissance operations conducted by the secret Studies and Observations Group in order to gather intelligence on PAVN / NLF activities in the border regions ( Project Vesuvius ) . This intelligence data would then be presented to tdaprince in an effort to change his mind .