Disclaimer: I am not a tattoo person. Don't understand them, but to each his/her own.
I don't find the tattoo offensive and don't see a real problem. But it depends on where you work at, really. In r/r911's neck of teh woods, apparentyl, you had better cover it up. In my county, probably not a problem. when I worked Ambulance, the companies policy was very strict on dress and grooming, but even they saw piercings ans tattoos as a personal choice. Maybe it affected their hiring proccess a bit, but once on board, as long as it wasn't vulgur, then so be it. The Ambulance service where I'm at has the most lax standards I know and would probably want to know why I am not inked up with a dragon on my neck. SAR, likewise doesn't really seem to care.
Cover it up for the hiring proccess if you want to skate past any tattoo questions. but, if you want to be an honest EMT, be straight forward with it, don' hide it, and see what happens. Like all jobs, some employers mught be offended and sme "no way", others will be offedned and tell you to cover it while at work, and others will compare tats with you and bingo... you are hired. DEPENDS, but I'm not offended. Hell I once hired a 20 year old EMT for the Snow Park who had 3 piercings in his lips, three on each ear, and a mural on his arm. "Take the studs/rings out when you are here!"