小布什总统曾经访问过我所在的城市。正好住在我工作的公司对面的旅馆。当天该旅馆周围三条街禁止交通。从我的窗口望去，可以看到旅馆房顶的四面，都趴着架好了家伙事儿，随时准备开火的狙击手。下文介绍美国总统出行时，特别勤务局采取的其他十三项安保措施。摘自 https://www.oregonlive.com/politics/2015/05/13_ways_secret_service_agents.html。 6park.com
1. Agents come early
According to Robinson, Secret Service agents and White House staff first visit the president's destination up to three months in advance to meet with local agencies. There's a lot to do: They have to clear airspace at the airport during the president's arrival, request a motorcade route through town, identify nearby trauma hospitals and secure safe locations for the president in the event of an attack.

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2. They warn problem folks they'll be watched
Kessler explained that agents work with local police to identify any possible threats, namely those labeled as "Class 3" threats. This is the most serious category of possible threats, because they've threatened the president in the past and have the capability to carry out those threats, he said. The agents then contact those people and warn them that they'll be watched closely while the president is in town.
3. They bring the dogs
As the president's arrival date nears, agents check each stop on the president's route with bomb-sniffing dogs and clear nearby streets of all parked cars to ensure that no one can plant a car bomb near the president's hotel, Robinson said. They also set up canopies where the president will exit his limousine, so he's not exposed, he said.
4. They notify hospitals
Robinson said agents must ensure that the president will never be more than 10 minutes away from a trauma hospital, and an agent is stationed at each hospital, ready to coordinate with doctors and other agents in the event of a medical emergency. 6park.com
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5. They keep an extra plane nearby
According to Kessler, the president will most likely arrive at Portland International Airport in Air Force One, the official jet of the office (which was just returned to him after a lengthy tune-up). But before his official jet arrives, a backup plane similar to Air Force One will touch down at a secret location, he said, just in case something happens to the primary mode of transport.
6. Thousands of people are involved
But that's not all: Robinson said at least six planes will fly in with the president. Some of these planes will hold cargo, like helicopters, limousines and communication equipment, and others will hold hundreds of agents and staff members. "Every time he moves, thousands of people are involved," Robinson said.
7. They shut down highways
As The Oregonian's Joe Rose reported, in the past, the Secret Service has moved the president "the wrong way" on freeways, closing eastbound I-84, for example, to allow the 20-vehicle motorcade to go west in the empty lanes. 6park.com
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8. They sneak the president in through the back
When President Obama arrives at his hotel, he probably won't be strolling through the front doors, Kessler said. (Could you imagine the president getting stuck in those revolving doors? Security nightmare.) Instead, agents will use the hotel's loading dock, perhaps leading the president in through the kitchen, he explained.
9. Agents background all hotel workers
Before the president arrives, Secret Service agents run background checks on all hotel employees, Kessler said. Anyone with any record of violence - even a minor charge like fourth-degree assault - will be asked not to come in to work during the president's stay, he said.
10. They clear out three floors of the hotel
In addition to the floor containing the president's suite, agents will also cordon off the floors above and below his room. No one, except those in the president's detail, will be able to stay in those rooms, Kessler said.
11. They throw out the electronics 6park.com
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Before the president arrives in his room, agents perform a complete sweep of all rooms where the president will be, Kessler said. They'll check for bugging devices and concealed explosives. Then the agents will take apart all pictures to ensure nothing is hidden in the frames. They also place bulletproof plastic over the windows, he said. They also remove the phones and TVs to ensure the room is devoid of wiretapping and eavesdropping devices and replace them with their own secure electronics, Kessler said.
12. They set up three perimeters
According to Robinson, agents establish three security perimeters around the president: Police form the outer perimeter, general Secret Service agents make up the middle perimeter, and Presidential Protective Division agents provide the innermost shield.
13. They watch the pot
When the president travels, he often brings his own food with him, Robinson said. He also brings along a crew of cooks and servers, who buy groceries and prepare food for the president separately in an available kitchen as Secret Service agents watch to make sure no one interferes.