
But the incident -- the actual story that didn’t happen -- is a great opportunity to speculate about it.
Like any of Obama's trips, even a cancelled one requires complex advance planning, for example that a factory tour route be scouted1, usually with instructions to avoid places requiring that the president wear1 a hardhat, which along with those goofy bike helmets, he does not like. But if everything goes well, no one will ever hear or see6 anything about the advance teams, which will be enroute to the president's next trip-stop before he's back in the White House.

It is crucial that the security team plan1 only one travel route from the presidential aircraft to the plant. Safety requires that there be1 at least two alternatives and that only those on a Secret Service radio frequency know which one will be taken. They then request that the local police department station1 officers along the way.

The subjunctive mood expresses what someone/something might be or do, should be or do, or must be or do, in other words what is contrary to fact. It is used to express a wish, a command, or a contingent or hypothetical event.
1. In clauses that express what one wants, hopes, or imagines happening/what needs to happen:
1.a. It is vital that the backdrop be ideal.
1.b. He demanded that his press secretary hold his temper.
1.c. It was essential that the trip be cancelled.
1.d. The set-up requires that the program be running smoothly.
1.e. The situation requires that BP not be let off the hook.
This structure using the infinitive of a verb (regardless whether the sentence is present or past tense) is used typically after verbs like ask, command, demand, insist, propose, recommend, request that and after expressions like it is desirable/essential/important/vital/necessary that
2. In if-clauses when they express that something is not possible/not true in the present:
2.a. If he were in New Jersey, he would talk about the economy.
2.b. If he had a double, he could be in both places at the same time.
3. In if-clauses when they express that something is not possible/not true in the past:
3.a. If I had known about the oil-spill, they would have planned things differently.
4. In sentences that express a wish:
4.a. I wish off shore drilling were less dangerous.
5. With as if/as though to express that something is not true/not possible:
5.a. They behave as if they were not responsible for the whole mess.
To express the hypothetical nature of the statements in 2-5, the verb forms are backshifted, i.e. a condition in the present is expressed through the verb in the past tense, a condition in the past through the verb in past perfect.
6. When an if-sentence, however, speculates about something that is possible or true in general, the normal tense is used.
6.a. If you don't use the subjunctive to speculate about a situation that is NOT possible, you will be completely misunderstood.
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