Here’s an alternative take. It’s an oblique Battenburg pattern. Yes, I reversed the text on the hood/bonnet again. 
In the original yellow-green/blue over silver:
In white/blue over silver:
And now this one is an experiment in response to some feedback from commenters who mentioned that they preferred a 2-tone rather than a 3-tone color scheme, where one of the retroreflective block colors is very close or identical to the underlying base color of the vehicle itself. Also, another commenter mentioned white as being a near-universal security color, so I combined these two ideas into a single white scheme with blue text and patterning.
It’s hard to see because white is white, but it’s actually retroreflective white/blue decaling over white automotive paint:
What I like about this one is that the 2-tone white/blue looks really security-ish, while still retaining the retroreflective patterning that ties it in with the other emergency vehicles.
Here’s another white scheme, with yellow-green/blue oblique Battenburg, just to see what it looks like:
I’m a bit torn. The white base coat works well for security vehicles. The yellow-green/blue over white will likely tie in better visually with the other rescue/security vehicles, but the white/blue over white looks more like a private security vehicle. If I had to pick a favorite, I think I would pick the white/blue over white, with the yellow-green/blue over white coming in at a fairly close second.
I like how the oblique Battenburg pattern combines the most pleasing elements of the sideways chevrons with the functional utility of the traditional Battenburg pattern while looking interesting enough for SF, so I find that I kind of prefer it to the chevrons or the traditional “straight” Battenburg.
Thoughts?
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Like your thinking on combining battenburg and chevron.
In the UK, we have moved from the silver base colour on Police vehicles back to the more traditional white with reflective yellow and blue battenburg.
So a white base vehicle with blue and white reflective pattern would be my choice for Spaceport Security.
White/blue over white background. Absolute winner for me. Like you said, it looks like “mini-cops”.
Love the slanted batten burg by the way.
Blue and white on white!!!
At the risk of insisting, nothing screams ‘private’ (as opposed to governement/official) to me like brand logos… Either that of the spaceport or that of the third party providing the service to the spaceport.
Wow, unanimous so far. I must be on the right track.
The Chimp Helmsman: I considered “Spaceport Security” on the sides, but because I’m also trying not to break one of my other rules: “the less important it is, the more generically useful it needs to be”, I decided not to do that. My problem is that if I put “Spaceport Security” on the side, you wouldn’t be able to fish it out of your storage box and drop it into a mall parking lot or next to the guard shack at a power plant. The more broadly useful background items are, the more worth building they are.
The private company logo…I like the idea, but I’m a bit ambivalent because the rescue vehicles won’t have private company logos, and the security vehicle’s already kind of straying from the “keep them visually unified” bit on my list.
i like the oblique battenbug pattern a bit more than the chevrons but i still like the brighter colors
@Chris, how about a different but visually similar logos for the security vehicles and the fire and rescue ones? Maybe you hire both from the same company? After all, the more pies you can get your fingers in, the more money you can make.
Bravo! Like the oblique battenburg. Although, I am torn over the color scheme. I like the white/blue over white, but the HiViz of the yellow defines it as a spaceport security. Your comment about placing it anywhere (mall) does have significant weight.
So I would have to agree with the vote so far…but the HiViz Yellow is a VERY close second.
Any chance of two schemes like the different Numbers for the tug?
I think the oblique Battenburg on white (hold the mayo) is definitely the way to go. Though I’m also in the torn camp, I’m 99% in favour of the white/blue and 98% the yellow-green/blue (I’m holding back the extra 1% in case you pull a third option out of the hat)
While I can see the idea behind a company logo or some-such, I’m more in favour of a generic “fits anywhere” approach.
And updated in a new post!
Added a discreet logo to the doors. I’m also including both the white/blue and yellow/blue versions.