You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <alllinks galcontinue="Basic_Marine_Aviator_Character_Template|822" />
  </query-continue>
  <query>
    <pages>
      <page pageid="775" ns="0" title="Step by Step Joining" />
      <page pageid="779" ns="0" title="VMFA-235 Death Angels" />
      <page pageid="839" ns="0" title="Basic Skills" />
      <page pageid="840" ns="0" title="CCR" />
      <page pageid="900" ns="0" title="MRC Game Bible" />
      <page pageid="1461" ns="0" title="Sstatistics" />
      <page pageid="1471" ns="0" title="High Level Career/Extensive University Education (6 or more years)" />
      <page pageid="1472" ns="0" title="Career/University Education (4 years)" />
      <page pageid="1476" ns="0" title="Career/Specialty Education (2 years)" />
      <page pageid="1477" ns="0" title="Part-Time/Menial Labour (High School Education)" />
    </pages>
  </query>
</api>