A joke. I guess

This is supposed to be funny, I guess. But the humor of it is beyond me. Maybe you can find something funny.

The other day, I needed to go to the emergency room.

Not wanting to sit there for 4 hours, I put on my old Army fatigues and stuck a patch that I
had downloaded off the internet onto the front of my shirt.

When I went into the E.R., I noticed that 3/4 of the people got up and left. I guess they
decided that they weren't that sick after all.

The patch is attached. Feel free to use it the next time you're in need of quicker Emergency
Room service.

Maybe I'm intellectualizing this "joke" too much. Because last time I checked the Border Patrol wore traditional green uniform. So unless the narrator of the joke is wearing "fatigues" from the Vietnam era, Army BDUs are camo these days. And even then Vietnam era fatigues would be the wrong shade of green. I don't get it.