The way you're loading the font, only the italic version is loaded. Therefore the font will only show if you specify italic explicitly in the span's style.
font-family:'Molle',sans-serif; font-style:italic;
By the way, can you change the HTML at all? If so, please don't use an inline style and then try to override it with a stylesheet, using the style attribute for a selector. Not only does it look ugly and patchy, but it won't work, it won't do anything. The inline style attribute has a higher specificity than a stylesheet.
Either put in the above as the inline style for the span, or give the span a class and use that in the stylesheet to address it.