All of the models are different and pretty much off the shelf products. The one I had was a Motorola where our S-6 shop (the commo weenies) added the extra wizardry to the phone to make it more secure. Other teams in our Batallion had different models of phones.
That said the one I had if you let the screen blank out in "Sleep" mode it would lock automaticly (it took about 45 seconds or so).
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