custom menu are not displaying

I am using one of the original menus but then I created two addy ones to go in the subtemplate at location of my choosing.
In the function php I have

PHP Code:

if ( function_exists('register_sidebars') )
register_sidebars(2);

if ( function_exists('register_nav_menus') ){
register_nav_menus(
    array(
    'engineers' => 'engineerMenu',
    'aboutUs' => 'aboutUs',
    )
);}

in the page w/the html/php i have:
PHP Code:
<?php get_sidebar( 'aboutUs.php' ); ?>

And lastly i went to the wp-admin area and in the menu section I have the theme location menu actives, the menu correctly name and saved…
but the two menus I created do not show up in their respective subtemplate.php.

Any suggestions on what I could have done wrong?
thx
D