The 1000-1500 word limit is what's considered "flash fiction" and it's the preferred format for stories on the 'net nowadays. A typical short shory is about 2500-5000 words long, though there are some notable shorter and long exceptions out there. Stories in excess of 25K words, up to 50K words are considered "Novelettes" as it is much longer than a short story, but not as long as a novel (50K words).
Writing? yes, I uh...write a little bit... Heh, but the flash fiction limitation doesn't surprise me. It's pretty common for the 'net now. Generally, flash fiction is the culmination "chapter" of several unseen chapters, the climax of the story, short, sweet, and to the point.
Depending on what size font you use and what your page borders are set as, 1000 words will fill one and a half to two pages single-spaced, or about 3 to 4 doublespaced.
Quick Q while I'm posting here: Although you prefer "combat" orientated fiction, I assume you take all kinds? Because, well, I'm difficult. Tell me I have to write a Western, and I'll write a space opera...so, tell me it has to be combat-orientated, and I'll write humor or a character piece. :P

I was just wondering if my efforts were wasted though, if there's no chance you'll take them.