I worked 30 years as a professional civilian employee in Law Enforcement. My contacts included the Chief of police, anyone in the chain of command, detectives and patrol personnel. I watched as diversity training was pushed out that included race, religion, ethnicity and the LGBT community and the officers had all the right answers and, for the most part, employed that training in the field. However when they got back in the squad room where it was just them, they still displayed all the things they had been trained not to show in public. As a civilian employee I was already a second class citizen in the organization, so I wasn't about to come out to them, even if I was protected by law.
I have to note that during the last few years there were a growing number of gay and lesbian officers and administrators who came out and were respected after having established themselves in the previous years. Now there is a former officer who is in the middle of a FtM transition and seems to have the support of those who knew them on the job.
How did I cope? My GD wasn't severe, but needed to be addressed rather than suppressed, so I cultivated outlets away from where I worked. Those outlets ranged from regular closeted dressing at home, CD.Com and similar internet social options and trips out of town where I was part of the crowd if I went out. Eventually I was able to find a local support group as well and since I retired I haven't looked back. Those folks I worked with did not need to know, but I needed social contacts, so I found them away from the work place. It was little more than compartmentalizing, but it worked for me.