I would like to say for anyone who wants to go, plan at least an hour for this.
I was just at the Washington Monument Tuesday, and I have to say it was the least enjoyable part of the trip.
First you need to get there before your ticket time (some people were there 3045 minutes prior).
They will not allow strollers, sodas, or anything besides water. (They will make you dump it! They did to me!)
After you get in line, the ranger will tell you to park the stroller if you have one and have other either drink or dump anything but water.
Then you go in bit by bit into the screening station. You are asked to remove all coats/sweatshirts to be X rayed individually. Since you are in a group of 20 or so people that takes a LONG time. All purses and back packs are screened individually. You aslo everyone goes through a metal detector . If anyone gets "beeped" the entire party can not go through. They will then search that person. (My son glasses caused the beep, they would not let anyone else through)
Once you get up, every other window is blocked out with a security camera. There is a total of four windows open. On Tuesday, there was a line four people deep to look out the windows. There was a line around the top for the return elevator which was about 25-30 people long (went around the whole base). Our total viewing time was less than 3 minutes!
Then the long walk back.