I had just started working at my duty station (on the u.s./mexico border) about a month prior... the park service is weird in that a lot of the time, when you first start you don't have much guidance. It's not like other police departments when you go through a long academy and field training. You go through a 3 month academy and try and find a job. Luckily I had spent the previous few months working at a busy urban park and had been trained fairly decently by my supervisor...
It was close to the end of my shift (maybe near 10pm?). The other officer on duty and I had parted ways and went to our separate ranger stations (about 1 - 1 1/2 hours away from each other) to do paper work until the end of shift.
I'm sitting in the office when dispatch comes on the air "###... ###... prepare for emergency traffic." (AKA shit's about to get real).
Dispatch - "Units be advised, border patrol is in pursuit of a vehicle southbound towards the park."
We copy. Formulate a plan and start driving north to meet up and handle it. It's about a 15-20 minute drive for me driving all out and about a 30-45 minute drive for the other officer.
The entire time I'm driving up there we're getting position updates. We tell dispatch to start waking up other rangers if the vehicle crosses into the park.
Dispatch - "Be advised. Vehicle has crossed the park boundary."
Driving up there. Pull out my rifle and charge it as I'm driving. Get to where we're supposed to meet up before anyone. Throw on my ceramic armor. Position my vehicle and wait. Meah while I'm watching BP and the suspect vehicle coming (from about 15-20 miles away).
Minutes later my chief shows up (I'm feeling very relieved). A minute after that the other ranger who was on duty shows up. I jump in his vehicle and we head a little further north to deploy spike strips.
We get into position.
Dispatch - "All units, be advised, suspects have bailed out. I repeat, suspects have bailed out."
We head to the area where they bailed. By this time about 4 or 5 other rangers are up and out. We did a quick search but came up empty. (Generally we don't do full scale searches at night).
Next day BP sent out more agents and their helicopter and we sent up our plane. 2 of the 3 suspects were found.
So for 1 month into the job... it was quite an experience.