Unless something new is in CSS3, you can't inherit styles from another selector. However you CAN include multiple classes on an element. Thus if you element was defined as:
<div id="content">
<div class="military">
<a class="A1 blue">Text</a>
</div>
</div>
Then it would benefit from both sets of classes. However, if the more specific rule contains a different value for a property declared in the less-specific selector, the more specific selector's value would override the less-specific one.
*Edit - minor grammar correction.