+1 to what Omahan said. Ladies who don't screen are low hangin fruit for LE.
99% of agencies don't give references. So, my opinion would be not to start with an agency.
P411 is a good way to get started. There are always different ways to screen a newbie. You just have to find a lady who is newbie friendly and willing to go the extra mile to get you screened.
My suggestion to you is this......Find the type of lady you wish to see, read the reviews on her and then give her a call or email and ask if she's newbie friendly.
I would be happy to continue this discussion privately but I do not use the PM system on this board. I turned them on briefly and it was 99% a huge waste of time. Please email me for more details. If you are not comfortable emailing outside of this board then my only other suggestion for you is to use P411. I have been able to adequately screen military men in the past so your profession does not create a big stumbling block.