I'm quite aware that orbital deployment is a far-fetched notion. However, the US Marines were keen as mustard on the idea at one time:
(You'll note that the postulated USMC space landing-craft is plainly a re-badged X-37! No doubt full of midget jarheads)
The idea would be to crashland your X-37 derived one-way/disposable troop carrier at the place of choice, or possibly to parachute the troops out once down to a reasonable speed and height. Alternatively, you might do a one-way Entebbe/TALO style op against a target runway, or splash down at sea or whatever. Of course, we're talking about an awfully long walk out again - or an enormous forced-entry followup invasion once the hostages are safe, nukes are seized - or whatever - no matter how you slice it: but that's true of any long-range parachute op, and special forces worldwide love those (or claim to ...)
As for spy payloads, no doubt we're all well aware of the DARPA Rapid Eye robospyplane-on-a-rocket ploy. Why not combine the plane and reentry-vehicle parts? Especially if that were also useful for other things.
Warheads, sure, why not just use ICBM RVs. There are such plans. But you might want to drop some specialist aeroplane payload like the MOP, MOAB etc; you might want to come down somewhere unexpectedly, that nobody could predict if they were tracking your orbit. You could get some flexibility with a winged RV.
Don't get me wrong - I don't think the US military really needs all this. But they might think they do; or someone might like to sell it to them; or some politician might like to have it made in his district.
Of course you're right, it might also make a fun sat-stealer, You Only LIve Twice style ...