Do these need to be aircrew (i.e. Flight-rated) boots? Cause that's a whole 'nother story.
I don't know about WA, but the CAWG supplement to 39-1 USED to only allow all leather or approved flight boots (I can't find it anymore -- I've heard it's down for revision). Flight approved boots have no nylon (they use some other kind of synthetic fabric) to melt into your feet in the event of a crash. It's getting hard to find a list of black USAF approved flight boots anymore since they have moved to the Sage Green and Desert Tan flight boots, but I have an old USAF policy letter that defines the black boots that are "safe to fly" and the 700, 770, & 790 are approved. There are probably some others for other services as well. I just bought the 700s for aircrew duties because the all leather make my feet sweat horribly (especially in the CA Central Valley :-)Dodd
The navy issue boot is available through MCS and it's less than $80. Polishable, steel toe, oil resistant sole.